Rheem RTGH-S84I IKONIC Super High Efficiency Condensing User Manual

CONDENSING TANKLESS WATER HEATER

AP22745 Rev 07

Do not destroy manual. Please read carefully and

keep in a safe place for future reference.

Print 2D

Bar Code

Here

CERTIFIED

www.ahridirectory.org

ULTRA

Low NOx

Emissions

SCAQMD Rule 1146.2

NSF/ANSI 372

SANITATION

WARNING:

If the information in these instructions is not

followed exactly, a ﬁre or explosion may result,

causing death, personal injury, or property dam-

age.

For Your Safety!

• Do not store or use gasoline or other ﬂammable

vapors and liquids in the vicinity of this or

any other appliance. To do so may result in an

explosion or ﬁre.

• Installation and service must be performed by

a qualified installer, service agency, or the gas

supplier.

USE AND CARE MANUAL

WITH INSTALLATION INSTRUCTIONS

FOR THE INSTALLER

Condensing 199,900 Btu/hr, 180,000 Btu/hr

and 157,000 Btu/hr Models

What to Do If You Smell Gas

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use

any phone in your building.

• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

• If you cannot reach your gas supplier, call the

fire department.

• Do not return to your home until authorized by

the gas supplier or fire department.

Safety

CONTENTS

READ THE SAFETY INFORMATION

Your safety and the safety of others are very important.

There are many important safety messages in this manual

and on your appliance. Always read and obey all safety

messages.

This is the safety alert symbol. Recognize this

symbol as an indication of Important Safety

Information! This symbol alerts you to potential

hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol

and either the word “DANGER,” “WARNING,” “CAUTION,” or

“NOTICE.”

These words mean:

IMPORTANT SAFETY INFORMATION

WARNINGS:

• Improper installation, adjustment, alteration, service,

or maintenance can cause death, personal injury, or

property damage. Follow the instructions in this manual.

READ ALL INSTRUCTIONS

BEFORE USING.

Be sure to read and understand the entire Use and Care Manual

before attempting to install or operate this water heater. It may

save you time and money. Pay particular attention to the Safety

Instructions. Failure to follow these warnings could result

in death or serious bodily injury. Should you have problems

understanding the instructions in this manual, or have any

questions, STOP and get help from a qualified service technician

or the local gas utility.

DANGER:

NOTICE:

CAUTION:

WARNING:

An imminently hazardous

situation that will result in

death or serious injury.

A potentially hazardous

situation that can result in

death or serious injury and/or

damage to property.

A potentially hazardous

situation that may result in

minor or moderate injury.

Attention is called to observe a

specified procedure or maintain

a specific condition.

Important Safety Information

Safety Precautions �� 2–8

Product Information

Product Information �� 8

Specifications �� 9, 10

Pressure Drop Diagram ��11

Typical Piping Diagram �� 12-14

Installation Instructions

Standards Compliance �� 16

Choosing a Location ��16, 17

Product Inspection ��18

Water Heater Installation��18–20

Mounting the Water Heater ��21

Venting �� 22-54

Multiple Unit Controls �� 55-57

Manifolded Water Heater with Recirculation Setup��58

Water Quality/Supply �� 59-63

Condensate ��63

Gas Supply �� 64-69

Electrical Wiring �� 69

Wiring Diagram ��70

Insulation Blankets & Installation Precaution��71

Piping for Space Heaters ��72

Recirculation Control �� 73-75

Service Alert �� 76

High Altitude Adjustments �� 77

Installation Checklist �� 78

Using Your Water Heater

Activating the Water Heater ��79-81

Setting the Water Temperature ��82-85

Recirculation Setting ��86-89

WiFi Setting �� 90, 91

Water Saving Control �� 92, 93

Caring for Your Water Heater

Water Heater Inspections �� 94, 95

Care and Cleaning �� 96, 97

Preventive Maintenance �� 98

Draining the Water Heater�� 99–101

Flushing of the Heat Exchanger �� 101, 102

Freeze Protection �� 103

Leak Sensor �� 103

Vacation and Extended Shutdown�� 104

Troubleshooting Chart �� 104, 105

Service Error Code Chart �� 106, 107

If You Need Service

Call for Assistance �� 107

Parts Ordering �� 108-112

Safety

IMPORTANT SAFETY INFORMATION

DANGER

FLAMMABLES

Flammable Vapors

Water heater has a main

burner flame.

The main burner flame:

1. which can come on

at any time and

2. will ignite flammable

vapors.

Vapors:

1. cannot be seen,

2. are heavier than air,

3. go a long way on the

floor and

4. can be carried from

other rooms to the

main burner flame by

air currents.

Vapors from flammable

liquids will explode and

catch fire causing death or

severe burns.

Do not use or store flammable

products such as gasoline,

solvents or adhesives in the

same room or area near the

water heater.

Keep flammable products:

1. far away from heater,

2. in approved containers,

3. tightly closed and

4. out of children's reach.

Installation:

Do not install water heater

where flammable products will

be stored or used unless the

main burner flame is at least

18" above the floor. This will

reduce, but not eliminate, the

risk of vapors being ignited

by the main burner flame.

Read and follow water heater warnings and instructions. If

owners manual is missing, contact the retailer or manufacturer.

Water Heater Venting Safety

DANGER:

• Failure to install and properly vent the water heater to

the outdoors as outlined in the “Venting” section of

the Installation Instructions in this manual will result in

death from fire, explosion, or asphyxiation from carbon

monoxide. NEVER operate this water heater unless the

vent and the air supply piping is properly installed and

terminated to the outdoors.

• Be sure to inspect the vent terminal, the air intake,

and the vent system on the water heater for proper

installation at initial start-up and at least annually

thereafter. Refer to the “Care and Cleaning” section

of this manual for more information regarding vent

system inspection.

WARNINGS:

• Gasoline and other flammable liquids, materials,

and vapors (including paint thinners, solvents,

and adhesives) are extremely dangerous. DO NOT

handle, use, or store gasoline or other flammable or

combustible materials anywhere in the vicinity of a

water heater or any other appliance. Be sure to read

and follow the labels on the water heater, as well as the

warnings printed in this manual. Failure to do so can

result in death, bodily injury, or property damage.

• Combustible construction refers to adjacent walls and

ceilings and should not be confused with combustible

or flammable products and materials. Combustible

materials, such as clothing, cleaning materials, or

flammable liquids, should never be stored in the vicinity

of this or any gas appliance. Fire or explosion can occur

causing death, personal injury, and/or property damage.

See page 17 for clearances to combustible materials.

• Follow vent manufacturer’s instructions for venting

installation, including additional clearances from

combustibles, to avoid conditions that can lead to

death, personal injury, and/or property damage.

• Use tankless water heater manufacturer-approved

Schedule 40 PVC (foam core is not permitted at any

time), Schedule 80 PVC, CPVC, ABS, UL 1738-listed

Category III Stainless Steel, or PP. No other vent material

is permitted. For Canada, installations must follow ULC

S636 for exhaust venting.

• Moisture in the flue gas will condense as it leaves the

vent terminal. In cold weather this condensate can

freeze on the exterior wall, under the eaves, and on

surrounding objects. Some discoloration to the exterior

of the building is to be expected. However, improper

location or installation may result in severe damage to

the structure or exterior finish of the building.

• For multiple-unit installation, a minimum distance

between vent terminations must be maintained to

prevent recirculation of vent gases. See page 39 for

information on venting and clearances to multiple

terminations.

CAUTIONS:

• Ensure that the appliance vent is securely glued and

attached to the vent connection on the top of the water

heater. DO NOT USE SCREWS.

• DO NOT operate without the condensate drain connected

and routed to a proper drain.

IMPORTANT SAFETY INFORMATION

Water Supply Safety

D ANGER

HOT

Water temperature over 125°F (52°C)

can cause severe burns instantly or

death from scalds.

Children, disabled and elderly are

at highest risk of being scalded.

See instruction manual before

setting temperature at water

heater.

Feel water before bathing or

showering.

Temperature limiting valves are

available, see manual.

BURN

Temperature Conversion Chart °F/°C (Reference only)

85 100 102 104 106 108 110 112 114 116 118 120 125 130 140 °F

29 38 39 40 41 42 43 44 46 47 48 49 52 54 60 °C

Time/Temperature Relationship in Scalds

120°F (49°C) More than 5 minutes

125°F (52°C) 1 1/2 to 2 minutes

130°F (54°C) About 30 seconds

135°F (57°C) About 10 seconds

140°F (60°C) Less than 5 seconds

145°F (63°C) Less than 3 seconds

150°F (66°C) About 1 1/2 seconds

155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

Water Temperature Time to Produce

a Serious Burn

Safety

DANGERS:

• WATER TEMPERATURE SETTINGS

– Safety and energy conservation

are factors to be considered when

selecting the water temperature

setting of a water heater’s remote

control. Water temperatures above

125°F (52°C) can cause death

or severe burns from scalding.

Be sure to read and follow the

warnings outlined on the pictured

label.

• There is a hot water scald potential

if the water temperature is set

too high. Households with small

children, the disabled, or elderly

persons may require a 120°F

(49°C) or lower temperature setting

to prevent contact with “HOT”

water.

• Before manually operating the

relief valve, make certain no one

will be exposed to the danger

of the hot water released by

the valve. The water may be hot

enough to create a scald hazard.

The water should be released into

a suitable drain to prevent injury or

property damage.

• Failure to perform the recommended Routine Preventive

Maintenance can harm the proper operation of this

water heater, which can cause carbon monoxide

dangers, excessive hot water temperatures, and other

potentially hazardous conditions.

WARNINGS:

• IMPORTANT: DO NOT apply heat to the HOT or COLD

water connections. If sweat connections are used,

sweat tubing to adapter before fitting adapter to the

water connections on heater. Any heat applied to the

water supply fittings will permanently damage the

internal components of the water heater.

• In case the pipe insulation is not rated for the

appropriate weather conditions, install electric heat

tracing or equivalent to prevent freezing of the pipes.

DO NOT insulate or block the drain valve on the hot

outlet fitting. If the pipes are allowed to freeze, the

water heater and the pipes may malfunction or leak due

to freezing water.

• Failure to drain the water heater as described on

"Draining the Water Heater" can cause serious personal

injuries from scalding and/or damage the water heater.

CAUTIONS:

• This water heater must only be used

with the following water supply system

conditions:

– With clean, potable water free of corrosive

chemicals, sand, dirt, or other contaminants.

– With inlet water temperatures above 32°F

(0°C), but not exceeding 120°F (49°C).

– DO NOT reverse the hot and cold water

connections. The water heater will not operate.

• Even when drained properly, a small

amount of water will remain in the water

heater. In cold weather conditions, this

water can freeze. If this happens, allow

the defrost protection on the heater

at least 30 minutes to melt the frozen

water or the water heater may not work

properly.

NOTICE:

The factory setting allows operating

temperatures between 100°F (38°C) and

120°F (49°C). Temperatures of 85°F (29°C)

and up to 140°F (60°C) can be achieved with

the control. Only qualified service personnel

should perform this adjustment. Only factory-

authorized control should be used.

IMPORTANT SAFETY INFORMATION

WARNINGS:

• The installation of gas piping must comply with local

utility company requirements and/or in the absence of

local codes, use the latest edition of National Fuel Gas

Code (NFGC), ANSI Z223.1/NFPA 54, or CAN/CSA B149.1,

Natural Gas and Propane Installation Code.

• If inlet gas pressure is out of allowable range [4.0” w.c.

(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, or [8.0”

w.c. (2.0kPa) – 13.0” w.c. (3.2kPa)] for LP gas, a gas

pressure regulator must be installed to maintain the

allowable inlet gas pressure.

• Should overheating occur or the gas supply fail to shut

off, turn off the manual gas control valve to the water

heater.

CAUTIONS:

• DO NOT attempt repair of electrical wiring, gas piping,

heater control, burners, vent connectors, or other safety

devices. Refer repairs to qualified service personnel.

• Turn off the manual gas shut-off valve if the water

heater has been subjected to overheating, fire, flood,

physical damage, or if the gas supply fails to shut off.

• DO NOT turn on the water heater unless the water and

gas supplies are completely opened.

Natural Gas and Liqueﬁed Petroleum Safety

DANGERS:

• Never attempt to convert the water heater from natural

gas to LP except by following the "Fuel Conversion

Instructions" for this model. The water heater must

only use the fuel type in accordance with listing on

data plate natural gas for natural gas units and LP for

LP units. Any other fuel usage will result in death or

serious personal injury from fire and/or explosion. This

water heater is not certified for any other fuel type.

• Both natural gas and propane (LP) have an odorant

added to aid in detecting a gas leak. Some people

may not physically be able to smell or recognize this

odorant. If you are unsure or unfamiliar with the

smell of natural gas or LP, ask the gas supplier. Other

conditions, such as “odorant fade,” which causes

the odorant to diminish in intensity, can also hide or

camouflage a gas leak.

• Water heaters using LP gas are different from natural

gas models in terms of orifice size and a gas chip. A

natural gas water heater will not function safely on LP

and vice versa.

• LP must be used with great caution. It is heavier than

air and will collect first in lower areas, making it hard

to detect at nose level.

• Before attempting to light the water heater, make sure

to look and smell for gas leaks. Use a soapy solution

to check all gas fittings and connections. Bubbling at

a connection indicates a leak that must be corrected.

When smelling to detect a gas leak, be sure to also sniff

near the floor.

• Gas detectors are recommended in LP and natural

gas applications and their installation should be

in accordance with the detector manufacturer’s

recommendations and/or local laws, rules, regulations,

or customs.

• Combustible materials, such as clothing, solvents,

cleaning materials, or flammable liquids, must not be

placed in the vicinity of the water heater.

• If a gas leak is present or suspected:

– DO NOT attempt to find the cause yourself.

– Never use an open flame to test for gas leaks. The gas can

ignite resulting in death, personal injury, or property damage.

– Follow the steps listed under “What to Do If You Smell Gas”

found on the front cover of this manual.

Safety

IMPORTANT SAFETY INFORMATION

Before operating this water heater, be sure to read

and follow the instructions on the label pictured below

and all other labels on the water heater, as well as the

warnings printed in this manual.

Failure to do so can result in unsafe operation of the

water heater, resulting in death, personal injury, or

property damage. Should you have any problems

reading or following the instructions in this manual,

STOP and get help from a qualified service technician.

WARNING : If you do not follow these instructions exactly, a fire or explosion may result

causing property damage, personal injury or loss of life.

FOR YOUR SAFETY READ BEFORE OPERATING

1.STOP! Read the safety information above on this label.

2.Turn off all electric power to the appliance.

3.DO NOT attempt to light the burner by hand.

4.Turn the Gas Shutoff Valve located on the outside of the unit

clockwise to the "OFF" position.

5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in

the safety information above on this label. If you don't smell gas, go to the next step.

6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to

the "ON" position.

7.Turn on all electric power to the appliance.

8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"

and call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

Turn off all electric power to the appliance if service is to be performed.

Turn

the

Gas

Shutoff

Valve

located

the

outside

the

unit

clockwise to

the

"OFF"

position.

GAS SHUTOFF

VALVE

OPEN CLOSE

OPERATING INSTRUCTIONS

Safety

IMPORTANT SAFETY INFORMATION

Electrical Safety

DANGER:

• Shock Hazard – Make sure the electrical power to the

water heater is off to avoid electric shock that will

result in death or serious personal injury.

WARNINGS:

• For your safety, the information in this manual must

be followed to minimize the risk of fire, explosion, or

electric shock that can result in death, personal injury,

and/or property damage.

• Field wiring connections and electrical grounding must

comply with local codes or, in the absence of local

codes, with the latest edition of the National Electrical

Code, ANSI/NFPA 70, or in Canada, Canadian Electrical

Code, CAN/CSA C22.1, Part 1.

CAUTIONS:

• Label all wires prior to disconnecting for service.

Wiring errors can cause dangerous and improper

operation. Verify correct operation after servicing.

• For your safety, burner inspection and cleaning

should be performed only by qualified service

personnel.

• Make certain the power to the water heater is OFF

before removing the unit cover panel. Exposed

electrical components and moving parts can cause

personal injuries.

• For your safety, DO NOT attempt repair of electrical

wiring, gas piping, heater control, burners, vent

connectors, or other safety devices. Refer repairs to

qualified service personnel.

Safety

California law requires that water heaters must be

braced, anchored, or strapped to resist falling or

horizontal displacement due to earthquake motions. For

water heaters up to 52-gallon capacity, a brochure with

generic earthquake bracing instructions can be obtained

from: Office of the State Architect, 1102 Q Street, Suite

5100, Sacramento, CA 95814, or you may call 916-445-

8100 or ask a water heater dealer.

However, applicable local codes shall govern

installation. For residential water heaters of a capacity

greater than 52 gallons or tankless-style, consult the

local building jurisdiction code for acceptable bracing

procedures.

FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

IMPORTANT SAFETY INFORMATION

General Installation and Maintenance Safety

WARNINGS:

• This water heater must be installed in accordance

with these instructions, local codes, utility company

requirements and/or in the absence of local codes,

use the latest edition of the American National

Standard/National Fuel Gas Code (NFGC), ANSI Z223.1

and National Fire Protection Association, NFPA 54, or

in Canada, CAN/CSA B149.1, Natural Gas and Propane

Installation Code, and the latest edition of the

National Electrical Code, ANSI/NFPA 70, or in Canada,

Canadian Electrical Code, CAN/CSA C22.1, Part 1.

• For your safety, DO NOT attempt to disassemble this

water heater for any reason. Improper adjustments,

alterations, service, or maintenance can cause death,

personal injury, or property damage.

SAVE THESE INSTRUCTIONS

SAFETY PRECAUTIONS:

Read this manual entirely before installing and/or

operating the water heater.

Use this water heater only for its intended purpose as

described in this Use and Care Manual.

Have the installer show you the location of the gas shut-

off valve and how to shut it off if necessary. Turn off

the manual shut-off valve if the water heater has been

subjected to overheating, fire, flood, physical damage,

or if the gas supply fails to shut off.

Be sure your water heater is properly installed in

accordance with local codes and the provided

installation instructions.

DO NOT attempt to repair or replace any part of your

water heater unless it is specifically recommended in

this manual. All other servicing should be referred to a

qualified service technician.

PRODUCT INFORMATION

For Your Records

Write down and save the following product

information along with the original sales slip and/

or cancelled check. The model and serial numbers

can be found on the top label on the right side of the

water heater.

MODEL NUMBER:

SERIAL NUMBER:

DATE OF INSTALLATION:

INSTALLING COMPANY/PHONE NUMBER:

PLUMBING CONTRACTOR/PHONE NUMBER:

See page 107 for additional service information.

Read This Manual

Inside you will find many helpful hints on how to use and

maintain your water heater properly. A little preventive care

on your part can save you time and money over the life of

your water heater.

You’ll find many answers to common problems in the

"Troubleshooting Chart" on this Use and Care Manual.

Always refer to this chart before calling for service.

Referring to this chart before calling may answer your

question(s) and eliminate the need for service.

Pre operating Checklist

Is the main gas valve to the water heater turned on?

Is the fuse in place or is the breaker turned on?

Does the water heater’s electronic ignition light?

Is the water temperature set to a safe temperature?

Is the water heater connected to a floor drain?

Is the water heater properly vented to the outside?

Is the water heater installed in a safe location away

from flammable materials and/or freezing conditions?

Product Information Safety

PRODUCT INFORMATION

Product Information

(440 mm)

(170 mm)

(116 mm)

(899 mm)

(459 mm)

Air Intake

(760 mm)

(45 mm)

(35 mm)

(726 mm)

(128 mm)

Exhaust Vent

2" (51 mm)

5" (127 mm)

" (286 mm)

Hot Outlet

Fitting

Recirculation

Fitting

(Available only on

certain models)

Condensate

Drain

Cold Inlet

Fitting

(333 mm)

(101 mm)

(348 mm)

(170 mm)

(135 mm)

Gas Supply Fitting

(440 mm)

(170 mm)

(116 mm)

(899 mm)

(459 mm)

Air Intake

(760 mm)

(45 mm)

(35 mm)

(726 mm)

(128 mm)

Exhaust Vent

2" (51 mm)

5" (127 mm)

" (286 mm)

Hot Outlet

Fitting

Recirculation

Fitting

(Available only on

certain models)

Condensate

Drain

Cold Inlet

Fitting

(333 mm)

(101 mm)

(348 mm)

(170 mm)

(135 mm)

Gas Supply Fitting

(440 mm)

(170 mm)

(116 mm)

(899 mm)

(459 mm)

Air Intake

(760 mm)

(45 mm)

(35 mm)

(726 mm)

(128 mm)

Exhaust Vent

2" (51 mm)

5" (127 mm)

" (286 mm)

Hot Outlet

Fitting

Recirculation

Fitting

(Available only on

certain models)

Condensate

Drain

Cold Inlet

Fitting

(333 mm)

(101 mm)

(348 mm)

(170 mm)

(135 mm)

Gas Supply Fitting

Speciﬁcations – Direct-Vent Models

TOP VIEW

BOTTOM VIEW

FRONT VIEW

PRODUCT INFORMATION

Speciﬁcations

Product Information

MODEL NO.

DIRECT-VENT AUTOMATIC INSTANTANEOUS WATER

HEATER FOR INSTALLATION IN A MANUFACTURED

HOME (MOBILE HOME) OR RECREATIONAL VEHICLE"

CSA/ANSI Z21.10.3 • CSA 4.3-2019

FOR INSTALLATION ONLY

PWWYY00001

XXXXX

TYPE OF GAS: GAS

MAX. INLET GAS PRESSURE: "w.c.

MIN. INLET GAS PRESSURE: "w.c.

RECOVERY RATING: GALLONS/HR

MAX. WORKING PRESSURE: 150 psi

ELECTRICAL RATING: 120V 60HZ LESS THAN 2 AMPS

MAX. INPUT: BTU/HR,

MIN. INPUT: BTU/HR,

MANIFOLD PRESSURE: "w.c. (FOR MAX. INPUT)

This appliance must be installed in accordance with local codes or, in the absence of local codes,

the National Fuel Gas Code. ANSI Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and Propane

Installation Code.

"Suitable for combination water(potable) heating and space heating and not suitable for space heating applications

only." "The water heater shall not be connected to any heating system or component(s) previously used with a

nonpotable water heating appliance"

"A pressure relief valve listed as complying with the Standard for Relief Valves and Automatic Gas Shutoff Devices for

Hot Water Supply Systems, ANSI Z21.22 shall be installed at the hot water outlet connection of the water heater at the

time of installation of the heater. Local codes shall govern the installation of relief devices. For safe operation of the

water heater, the relief valve(s) must not be removed or plugged. No valve shall be placed between the relief valve and

the water heater. The relief from the discharge of the pressure relief valve shall be disposed of in a suitable place

where it will cause no damage. Also there shall be no other reducing coupling or other restrictions installed on the

discharge line to restrict flow. See Installation Manual Heading, "PRESSURE RELIEF VALVES" for installation and

maintenance of relief valve discharge line and other safety precautions." Turn off the electrical power and gas shutoff

valve. Lift and release lever on the relief valve and check the manual operation of relief valve at least once a year."

"Make certain the discharged water is directed to a suitable drain. Avoid contact with hot water and prevent water

damage."

Complies with jurisdiction having 14 ng/J NOx regulations.

"MINIMUM CLEARANCE FROM COMBUSTIBLE OR NONCOMBUSTIBLE CONSTRUCTION: 1/2" SIDE CLEARANCE

FROM FLANGED ENDS TO WALL; 0" REAR CLEARANCE-FROM MOUNTING BRACKET TO WALL; 12" TOP

CLEARANCE-FROM TOP OF HEATER TO CEILING; 12" BOTTOM CLEARANCE-FROM BOTTOM OF HEATER TO

FLOOR; 12" FRONT CLEARANCE)-FROM FRONT OF HEATER TO CLOSET DOOR" "NOTE: 24" MINIMUM

RECOMMENDED FRONT CLEARANCE FOR SERVICE AND MAINTENANCE." "WIRING DIAGRAM BEHIND THE

FRONT COVER."

FOR YOUR SAFETY : DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE

VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

The following product informa-

tion can be found from the rating

label on this water heater.

A. Model Number

B. Serial Number

C. Data Bar Code

D. Heater Type

E. Installation Type

F. Type of Gas

G. Max. Inlet Gas Pressure

H. Min. Inlet Gas Pressure

J. Recovery Rating

K. Max. BTU Input Rating

L. Min. BTU Input Rating

M. Manifold Gas Pressure

N. Certification Stamp

P. Alternate Approval Stamp

Q. Clearances

English Rating Label

English/French Rating Label

INSIDE OF FRONT COVER

Inside of

top panel

PRODUCT INFORMATION

Product Information

0 20 40 60 80 100 120

0.0 2.0 4.0 6.0 8.0 10.0 12.0

140

120

100

Pressure Drop (PSI)

Water Flow Rate (GPM)

Delta T - Temperature Rise (°F)

Pressure Drop (ft of head)

Water Flow Rate (GPM)

199k Btu/h 180k Btu/h 157k Btu/h

Pressure Drop Curve

Temperature Rise Curve

199k Btu/h 180k Btu/h 157k Btu/h

0 20 40 60 80 100 120

0.0 2.0 4.0 6.0 8.0 10.0 12.0

140

120

100

Pressure Drop (PSI)

Water Flow Rate (GPM)

Delta T - Temperature Rise (°F)

Pressure Drop (ft of head)

Water Flow Rate (GPM)

199k Btu/h 180k Btu/h 157k Btu/h

Pressure Drop Curve

Temperature Rise Curve

199k Btu/h 180k Btu/h 157k Btu/h

Graph above generated at 35°F Delta T. Graph below generated with 70°F (21°C) inlet water temperature

PRODUCT INFORMATION

Typical Piping Diagram

Typical Direct-Vent Water Heater (No Recirculation)

(Shown Without Venting)

Right Side View

Product Information

Inlet Water Fitting

With Water Filter

User

Interface

*Condensate Pipe

Neutralizer

Relief Valve

Drain

Valve

Manual Gas

Supply Line

Shut-Off Valve

*Note: A flexible drain tube can be used

Service

Valves

Hot

Water

Outlet

Hot Water

Outlet

Service

Valve

Sediment

Trap

Cap

Power

Supply

Cord

Union

Cold Water Supply

Gas

Supply

To Suitable

Drain

To Suitable

Drain

To Suitable

Drain

To Hot Water

Faucet(s)

Condensate outlet

*Piping diagram for reference only. Ensure all

necessary components are included, per local and

national code.

Product Information

PRODUCT INFORMATION

Typical Direct-Vent Water Heater (Recirculation via Dedicated Line)

(Shown Without Venting)

Inlet Water Fitting

With Water Filter

Relief Valve

Drain Valve

Manual Gas

Supply Line

Shut-Off Valve

*Note: A flexible drain tube can be used

Service Valves

Sediment Trap

Cap

Power

Supply

Cord

Union

Cold

Water

Supply

Condensate Pipe*

Gas Supply

Suitable

Drain

To Hot Water

Faucet(s)

Condensate outlet

Recirculation Return Line

User Interface

Neutralizer

To Suitable Drain

*Piping diagram for reference only. Ensure all

necessary components are included, per local and

national code.

Typical Outdoor Water Heater

(Outdoor Conversion Kit Required - sold separately)

PRODUCT INFORMATION

This converted outdoor water heater is for OUTDOOR installation only.

DANGER

DO NOT install this water heater indoors or in a confined space. It is designed for outdoor

installation only. Any other type of installation will result in death or serious personal injury.

Inlet Water Fitting

With Water Filter

Neutralizer

Relief Valve

Drain Valve

Manual Gas

Supply Line

Shut-Off Valve

*Note: A flexible drain tube can be used

Service

Valves

Sediment Trap

Cap

Power

Supply

Cord

Union

Cold Water Supply

Condensate Pipe*

Gas Supply

To Suitable

Drain

To Suitable

Drain

To Hot Water

Faucet(s)

Condensate outlet

*Piping diagram for reference only. Ensure all

necessary components are included, per local and

national code.

Product Information

INSTALLATION

INSTRUCTIONS

FOR THE

CONTRACTOR

Installation

INSTALLATION INSTRUCTIONS

Standards Compliance

This water heater must be installed in accordance

with these instructions, local codes, and utility

company requirements.

In the United States where local codes are not

available, use the latest edition of the American

National Standard/National Fuel Gas Code. A copy

of the Fuel Gas Code can be purchased from either

the American Gas Association, 400 North Capitol

Street Northwest, Washington, DC 20001, as

ANSI standard Z223.1, or National Fire Protection

Association, 1 Batterymarch Park, MA 02269 as

NFPA 54.

In Canada, use the latest edition of the CAN/CSA

B149.1 Natural Gas and Propane Installation Code

and the Canadian Electrical Code, CAN/CSA C22.1,

Part 1.

A copy can be purchased from; Canadian Standards

Association, 5060 Spectrum Way, Mississauga, ON

L4W 5N6

Choosing a Location

WARNING:

Fire Hazard –Combustible construction refers to adjacent

walls and ceilings and should not be confused with

combustible or flammable products and materials.

Combustible materials, such as clothing, cleaning

materials, or flammable liquids, must not be placed against

or next to the water heater. Fire or explosion could occur

causing death, personal injury, and/or product damage.

A gas-fired water heater should never be installed in a

space or room where liquids with flammable vapors are

used or stored. Such liquids include gasoline, LP gas

(butane or propane), paint, adhesives and their thinners,

solvents, or removers. Flammable vapors carry long

distances from where they are used or stored. The open

flame of the water heater’s main burner can ignite these

vapors causing an explosion or fire.

NOTICE:

Elevating a gas-fired water heater will reduce but NOT

eliminate the possibility of lighting the vapor of flammable

liquids which may be improperly stored or accidentally

spilled.

NOTICE:

This water heater should not be located in an area where

water leakage of the heat exchanger or connections will

result in damage to the area adjacent to it or to lower

floors of the structures. When such areas cannot be

avoided, install a suitable catch pan with an adequate

drain under the water heater.

The following requirements will ensure a safe

installation:

• The water heater must be located in an area where

it won’t sustain damage from moving vehicles,

flooding, etc. If the water heater is installed in a

storage garage, the direct ignition system and main

burner should be no less than 18 in. (45 cm) above

the garage floor.

• If the water heater is installed in a repair garage or

in a private garage, the direct ignition system and

main burner should be no less than 4.5 ft (1400

mm) above the garage floor.

• The water heater should be installed as close as

possible to the vent exhaust and air intake. This

minimizes the vent length and the number of

elbows and joints required for venting.

• The water heater should be installed with the

correct venting and exhaust materials. See

"Venting" on this Use and Care Manual.

General

Exhaust Vent Pipe

Air Intake Pipe

0" min.

(0 mm)

12"

(300 mm)

Minimum

Upward Slope

to Termination

NOTE: Diagram for reference,

venting should be installed side

by side. DO NOT install vent

terminations one above the other.

INSTALLATION INSTRUCTIONS

General

• Every vent or air intake pipe penetration of a floor

or ceiling should be sealed.

• Failure to install and properly vent the water heater

to the outdoors as outlined on "Venting" can result

in unsafe operation.

• Long hot water lines should be insulated to

conserve water and energy.

• The water heater and water lines should be

protected from exposure to freezing temperatures.

• Manufactured home approved.

• Minimum water heater clearances from

combustible and noncombustible construction are

as follows:

– 1/2 in. (1.3 cm) for sides and front.

– 0 in. (0 cm) for rear with support bracket(s)

– 12 in. (30 cm) from the bottom and top

– 0 in. (0 cm) for vent or air intake pipe

NOTICE:

Preferred maintenance clearance is 24 in. (61 cm)

from top, bottom, and front of unit.

12" min.

(300 mm)

1/2" min.

(13 mm)

1/2" min.

(13 mm)

12" min.

(300 mm)

(0 mm)

0" min.

(0 mm)

Sealing Plate

• DO NOT install the water heater in areas

prohibited by National Fuel Gas Code in

U.S. installation or CAN/CSA B149.1 in

Canadian installation.

• DO NOT install the water heater where it

is subject to vibrations.

• DO NOT install the water heater in a boat,

or other watercraft.

• DO NOT install the water heater near

vents for heating and cooling unless a

minimum clearance of 4 ft (1.2 m) is

maintained.

Choosing a Location (cont.)

INSTALLATION INSTRUCTIONS

General

Product Inspection

Visually inspect the water heater for any possible

damage.

Check the rating plate on the water heater to make

sure the water heater was designed to be used with

the supplied type of gas (natural or LP).

Verify that all included supplied parts are present as

shown.

Water Heater Installation

Corrosive Atmosphere

NOTICE:

The water heater should not be installed near an air supply

containing halogenated hydrocarbons where contaminants

can enter the combustion air supply.

Avoid installing a water heater in any of the

following locations: beauty shops, dry-cleaning

establishments, photo processing labs, and storage

areas for liquid and powdered bleaches or swimming

pool chemicals. These locations often contain such

halogenated hydrocarbons.

The air supply containing halogenated hydrocarbons

is safe to breathe, but when passed through a gas

flame, corrosive elements are released that will

shorten the life of any gas-burning appliance.

Propellants from common spray cans or gas leaks

from A/C and refrigeration equipment are highly

corrosive after passing through a flame.

NOTICE:

The water heater warranty is void when the failure is due

to operation in corrosive conditions.

Screws

Mounting Bracket

Washers

Pressure

Relief

Valve

LP Gas Conversion Kit

Service valve

for hot water

Cross Over Valve

Service valve

for cold water

Included Items

Some Models Only

NAT

The default settings of this water heater are as follows:

Factory Settings

FACTORY SETTINGS

Set temp. 120°F

Recirc Pump Mode None

Manifold Heaters

Water Saver Mode OFF

Elevation Sea Level

TemP. Unit Fahrenheit

Service Alert OFF

Beep on Alarm OFF

Display DISABLED

INSTALLATION INSTRUCTIONS

Start/Adjust

General

NOTICE:

The National Fuel Gas Code (NFGC) and CAN/CSA B149.1 mandate a manual gas shut-off valve.

See NFGC/B149.1 for complete instructions. Local codes or plumbing authority requirements may vary from the instructions

or diagrams provided and take precedence over these instructions.

Typical Installation of Direct-Vent Water Heater

Water Heater Installation

*Note: A ﬂexible drain tube can be used.

Wall Plate

(Recommended)

Outside Wall

Drain Valve

Cap

Sediment Trap

Manual Gas

Supply Line

Shut-Off Valve

Power Supply Cord

Exhaust Vent Pipe

Condensate Drain*

To Hot Water Faucets

Cold Water

Supply Line

Service Valve

(supplied)

To Suitable

Drain

To Suitable

Drain

90° Elbow

Air Intake

Pipe

Upward Slope to

outside termination

90° Elbow

INSTALLATION INSTRUCTIONS

NOTE: Diagram for reference,

venting should be installed side

by side. DO NOT install vent

terminations one above the other.

General

INSTALLATION INSTRUCTIONS

Mounting the Water Heater

CAUTION:

Reinforcement of the wall is required where the wall is not

strong enough to hold the water heater. Failure to do so

could result in personal injury and/or property damage.

The mounting location for the water heater should

allow for easy access and operation.

The water heater is designed to be installed either

inside the wall cavity between the wall studs or

outside the wall cavity. Either installation requires the

water heater to be supported with a wooden support

brace between the wall studs, or a piece of wood

that is equal in size to the water heater and securely

attached to the wall studs before the water heater is

attached to it. This piece of wood can be installed

inside or outside of the wall. Use wood screws to

secure brackets to wall. If mounting to a concrete

wall, use lag bolts designed for concrete.

Make sure the proper electrical outlet or supply (120

VAC/60 Hz) is available and located near the unit. All

models come with a 6-ft. (1.8 m) power cord.

NOTE:

Outdoor installations require hard-wiring, consult

instructions in the Outdoor Conversion Kit (sold

separately) before mounting.

Attach the mounting bracket to the wall and secure it

by 4 screws and washers. Make sure it is level.

Align the grooves on the back of the water heater

with the tongues on the mounting bracket and hang

the water heater on the bracket. When mounted with

the mounting bracket, the water heater will have a

5/8" (16 mm) clearance from the back of the wall.

Using two screws and washers , secure the lower

mounting bracket to the wall.

DANGER:

Failure to properly vent the water heater to the outdoors

as outlined in this Venting section will result in death or

serious personal injury. To avoid the risk of fire, explosion,

or asphyxiation from carbon monoxide, NEVER operate the

water heater unless it is properly vented and has adequate

air supply for proper operation as outlined in this Venting

section. This water heater must have air supply connected

and terminated to the outdoors for direct vent application.

Combustion air requirements of room air application shall

follow “Room Air Application” in this Use and Care Manual.

WARNING:

Refer to page 17 for required clearances to combustible

materials. Improper clearances can cause explosion or fire

resulting in death, personal injury, and/or product damage.

CAUTIONS:

•

Check to make sure flue gases DO NOT recirculate into the

air intake terminal when using direct venting. If the water

heater is having service issues, flue recirculation may be a

contributing factor.

• Even when the minimum vent terminal separation

distances are followed, recirculation may still occur

depending upon the location outside the building, the

distance from other buildings, proximity to corners,

weather conditions, wind patterns, and snow depth.

• Periodically check to make sure that flue recirculation

is not occurring. Signs of flue gas recirculation include

frosted or frozen intake terminals and condensate in the

intake terminal and venting system.

• Correction to flue recirculation may involve angling the

intake away from the exhaust terminal and increasing

the distance between them. Check to be sure the intake

and exhaust terminals are not obstructed, especially

during periods of below-freezing weather.

Venting Requirements

The installation of venting must comply with national

codes, local codes, and the vent manufacturer’s

instructions.

The vent exhaust and air intake shall terminate

outside as described in these instructions for direct

vent application. Combustion air requirements

of room air application shall follow “Room Air

Application” in this Use and Care Manual. DO NOT

vent this water heater through a chimney. It must be

vented separately from all other appliances.

NOTICE:

The unit can be vented using only the following approved

vent pipe material.

Use only 2 or 3 inch diameter pipe. Refer to local

codes for restrictions on the use of InnoFlue® PP,

PVC, CPVC, or ABS pipe and fittings. All exhaust

venting materials for product installed in Canada

must meet ULC-S636.

The use of cellular core PVC (ASTM F891), cellular

core CPVC, or Radel® (polyphenolsulfone) in non-

metallic venting systems is prohibited and that

covering non-metallic vent pipe and fittings with

thermal insulation is prohibited.

This water heater requires a special venting

system. Refer to venting supplier’s instruction for

complete parts list and method of installation.

The manufacturers and product lines listed on the

following tables have been tested and authorized to

safely operate with Rheem tankless water heater.

Approved Vent Materials, Fittings and Terminations:

* Can be 1 throught 9.

ABS is not permitted for exhaust vent in Canada

Approved Polypropylene Vent Manufacturer/Trade Name:

*Refers to variations in nominal size.

Venting for Direct-Vent Water Heater

Venting

Acceptable Materials

for Exhaust

Acceptable Materials

for Air Intake

Fittings

Terminations

(Manufactured

by Polytech)

Schedule 40,

ASTM D-1785

Schedule 40,

ASTM D-1785,

and DWV,

ASTM-D2665

Schedule 40,

ASTM D-2665

RXGY-G01

RXGY-G02

RXGY-G02C,

RH140, RH17*

RXGY-E03A

RXGY-G01C

PVC

Schedule 40,

ASTM F-441

Schedule 40,

ASTM F-441,

and CPVC 4120,

ASTM-D2846

Schedule 40,

ASTM F-438

CPVC

Schedule 40,

ASTM D-2661

Schedule 40,

ASTM D-2661

Schedule 40,

ASTM D-2661

ABS

Manufacturer

Trade Name

Single Wall Pipe

Elbow

Adapter

Non-Return Valve (NRV)

Siphon

Termination

Centrotherm

InnoFlue®

ISVL**** or ISVL****UV

ISELS****ISELL**** or ISELL****UV

ISAAL0202

ISNRV****

IASJBVS

ISLPT**** or ISTT****

INSTALLATION INSTRUCTIONS

Venting

DO NOT USE Schedule 20, Cell Core, Drain Pipe,

Galvanized, Aluminum or B-Vent.

InnoFlue®Flex vent is allowed to be used up to 50

ft (15.2 m) only when it is installed vertically or within

45 degree from perpendicular direction. DO NOT

use InnoFlue®Flex vent for any other installation,

or any other flexible vent. Refer to manufacturer’s

instruction for details.

Vent Lengths and

Control Adjustments

Before starting the vent installation, careful planning

should be given to the routing and termination of the

vent pipes. The length of the vent pipes (inlet and

outlet) should be kept to a minimum. Also, see pages

26–27 and 31-35 for vent terminal placement. Refer

to the maximum and minimum vent length charts

for the pipe sizes that can be used and the total

equivalent length of pipe that can be used. DO NOT

exceed equivalent length of pipe in maximum vent

length chart.

Venting for Direct-Vent Water Heater

Vent

System

Diameter

Min. Allowed Equivalent

Vent Length

Max. Allowed Equivalent

Vent Length

Vent

System

Termination

Inches Feet Meters Feet Meters

2 1 0�3 70 21�3 90° Elbow

3 1 0�3 150 45�7 90° Elbow

The vent termination is not included in the equivalency calculations.

NOTICE: A 90°, ¼ standard bend or long bend elbow is equivalent to 6 ft. (1.83 m) of straight pipe. A 45°, 1/8

standard bend or long bend elbow is equivalent to 2.5 ft. (0.76 m) of straight pipe. A 90°, short bend radius elbow

is equivalent to 12 ft. (3.66 m) of straight pipe.

DO NOT use unequal diameters of pipe and fittings for the vent system.

See examples below.

Short Bend 90° Elbow

OK to Use

Standard Bend 90° Elbow

OK to Use

Long Bend 90° Elbow

OK to Use

Elbow Examples

Venting for Direct-Vent Water Heater

NOTICE:

To use 3" vent pipe, an increasing adapter will be required.

WARNING:

To use Category III Stainless Steel, a proper transition part

will be required to prevent flue gas from leaking.

Depending on the size of pipe that is chosen for

venting the water heater, it might be necessary

to use a fitting for stepping down in pipe size, to

connect to the water heater.

All intake and exhaust venting components must

have the same diameter size. DO NOT use a

different size on the intake and exhaust venting.

The unit may be vented horizontally through a

wall or vertically through the roof. Pipe runs must

be adequately supported along both vertical and

horizontal runs. Maximum unsupported span is

recommended to be no more than 4 feet (1.2 m).

It is imperative that the first hanger be located on

the horizontal runs immediately adjacent to the first

90-degree elbow from the vertical rise. Only use

support isolation hanging bands. DO NOT use wire

to support pipe runs.

Stress levels in the pipe and fittings can be

significantly increased by improper installation.

If rigid pipe clamps are used to hold the pipe in

place, or if the pipe cannot move freely through a

wall penetration, the pipe may be directly stressed,

or high thermal stresses may be formed when the

pipe heats up and expands. Install accordingly to

minimize such stresses.

NOTICES:

• It is recommended that the air intake pipe and exhaust

pipe have a 1/4" per foot upward slope toward the

outdoors.

• Maintain the proper clearance between the vent pipe

and combustible or noncombustible materials as

described on page 17.

• A clearance of 0 in. (0 cm) is allowed between the vent

or air intake pipe and combustible material.

• Use proper support for the vent and air intake pipes.

• It is recommended the support method used isolates

the vent pipe from floor joists or other structural

members. This helps prevent transmission of noise and

vibration.

• DO NOT support, pin, or otherwise secure the venting

system in a way that restricts the normal thermal

expansion and contraction of the chosen venting

material.

Preexisting Venting Notes:

If the water heater is being installed as a

replacement for an existing water heater, a thorough

inspection of the existing venting and air intake

system must be performed prior to any installation

work. Verify that the correct materials, vent lengths,

and terminal locations as described in this manual

have been met. Carefully inspect the entire venting

and air intake system for any signs of cracks or

fractures, particularly at the joints between elbows

or other fittings and the straight runs of vent pipe.

Check the system for signs of sagging or other

stresses in the joints as a result of misalignment

of any components in the system. If any of these

conditions are found, they must be corrected in

accordance with the venting instructions in this

manual before completing the installation and

putting the water heater into service.

See next page for additional requirements for the

Commonwealth of Massachusetts.

INSTALLATION INSTRUCTIONS

Venting

Venting for Direct-Vent Water Heater

In the Commonwealth of Massachusetts

The Commonwealth of Massachusetts requires

compliance with regulation 248 CMR 4.00 and

5.00 for installation of through-the-wall vented gas

appliances as follows:

5.08: Modifications to NFPA–54, Chapter 10

(1) Revise NFPA–54 section 10.5.4.2 by adding a

second exception as follows:

Existing chimneys shall be permitted to have their

use continued when a gas conversion burner is

installed, and shall be equipped with a manual reset

device that will automatically shut off the gas to the

burner in the event of a sustained back-draft.

(2) Revise 10.8.3 by adding the following additional

requirements:

(a) For all side-wall, horizontally vented, gas-fueled

equipment installed in every dwelling, building,

or structure used in whole or part for residential

purposes, including those owned or operated

by the Commonwealth and where the side-wall

exhaust vent termination is less than seven (7) feet

above finished grade in the area of the venting,

including but not limited to decks and porches, the

following requirements shall be satisfied.

1. INSTALLATION OF CARBON MONOXIDE

DETECTORS. At the time of installation of the side-

wall, horizontally vented, gas-fueled equipment, the

installing plumber or gas fitter shall observe that

a hard-wired carbon monoxide detector with an

alarm and battery backup is installed on the floor

level where the gas equipment is to be installed.

In addition, the installing plumber or gas fitter shall

observe that a battery-operated or hard-wired

carbon monoxide detector with an alarm is installed

on each additional level of the dwelling, building,

or structure served by the side-wall, horizontally

vented, gas-fueled equipment. It shall be the

responsibility of the property owner to secure the

services of qualified licensed professionals for

the installation of hard-wired carbon monoxide

detectors.

a. In the event that the side-wall, horizontally vented, gas-

fueled equipment is installed in a crawl space or an attic,

the hard-wired carbon monoxide detector with alarm and

battery backup may be installed on the next adjacent

floor level.

b. In the event that the requirements of this subdivision

cannot be met at the time of completion of installation,

the owner shall have a period of thirty (30) days to

comply with the above requirements, provided, however,

that during said thirty (30) day period, a battery-operated

carbon monoxide detector with an alarm shall be

installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each

carbon monoxide detector as required in accordance

with the above provisions shall comply with NFPA 720

and be ANSI/UL 2034-listed and IAS-certified.

3. SIGNAGE. A metal or plastic identification plate shall

be permanently mounted to the exterior of the building

at a minimum height of eight (8) feet above grade directly

in line with the exhaust vent terminal for the horizontally

vented, gas-fueled heating appliance or equipment.

The sign shall read, in print size no less than one-half

(1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP

CLEAR OF ALL OBSTRUCTIONS.”

4. INSPECTION. The state or local gas inspector of the

side-wall, horizontally vented, gas-fueled equipment shall

not approve the installation unless, upon inspection,

the inspector observes carbon monoxide detectors and

signage installed in accordance with the provisions of 248

CMR 5.08 (2)(a)(1 through 4).

(b) EXEMPTIONS: The following equipment is exempt

from 248 CMR 5.08 (2)(a)(1 through 4):

1. The equipment listed in Chapter 10 entitled “Equipment

Not Required To Be Vented” in the most current edition of

NFPA 54 as adopted by the Board, and

2. Product-approved side-wall, horizontally vented,

gas-fueled equipment installed in a room or structure

separate from the dwelling, building, or structure used in

whole or in part for residential purposes.

EQUIPMENT VENTING SYSTEM PROVIDED. When the

manufacturer of product-approved side-wall, horizontally

vented, gas-fueled equipment provides a venting

system design or venting system components with the

equipment, the instructions provided by the manufacturer

for installation of the equipment and the venting system

shall include:

1. Detailed instructions for the installation of the venting

system design or the venting system components; and

2. A complete parts list for the venting system design or

venting system.

(d) MANUFACTURER REQUIREMENTS – GAS

EQUIPMENT VENTING SYSTEM NOT PROVIDED.

When the manufacturer of product-approved side-wall,

horizontally vented, gas-fueled equipment does not

provide the parts for venting the flue gases, but identifies

“special venting systems,” the following requirements

shall be satisfied by the manufacturer:

1. The referenced “special venting systems” instructions

shall be included with the appliance or equipment

installation instructions, and

2. The “special venting systems” shall be product-

approved by the Board, and the instructions for that

system shall include a parts list and detailed installation

instructions.

(e) A copy of all installation instructions for all product-

approved side-wall, horizontally vented, gas-fueled

equipment, all venting instructions, all parts lists for

venting instructions, and/or all venting design instructions

shall remain with the appliance or equipment at the

completion of the installation.

INSTALLATION INSTRUCTIONS

Venting

Venting for Direct-Vent Water Heater

Regulator vent outlet in the event no

regulator is present, H and I can be

disregarded.

Fixed

closed

15 ft

Fixed

closed

Inside

corner detail

Operable

Horizontal Vent Terminal Location for Direct Vent

The following information should be used for determining the proper location of the vent terminal for direct vent water

heaters.

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

US Installations

1 In accordance with current CAN/CSA-B149.1, Natural Gas and Propane Installation Code.

2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.

‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

A= Clearance above grade, veranda, porch, deck or

balcony.

12 inches (30 cm) 12 inches (30 cm)

B= Clearance to window or door that may be

opened.

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

C= Clearance to permanently closed window.

0 in (0 cm) 0 in (0 cm)

D= Vertical Clearance to ventilated soffit located

above the terminal within a horizontal distance

of 2 feet (61 cm) from the center line of the

terminal.

12 in (30 cm) 12 in (30 cm)

E= Clearance to unventilated soffit. 12 in (30 cm) 12 in (30 cm)

F= Clearance to outside corner. 24 in (61 cm) 24 in (61 cm)

G= Clearance to inside corner. 18 in (46 cm) 18 in (46 cm)

H = Clearance to each side of center line extended

meter/regulator assembly. above

3 feet (91 cm) within a height 15 feet (4.6 m) 3 ft (91 cm) within a height of 15 ft (4.6 m)

I = Clearance to service regulator vent outlet. 3 feet (91 cm) 3 feet (91 cm)

J = Clearance to nonmechanical air supply inlet to

building or the combustion air inlet to any other

appliance..

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

K = Clearance to mechanical air supply inlet.

6 feet (1.83 m)

3 feet (91 cm) above if within 10 feet (3 m)

horizontally.

L = Clearance above paved side walk or paved

driveway located on public property.

7 feet (2.13 m)+

7 ft (2.13 m) for mechanical draft system (Category I

appliances); vents for Category II and IV appliances

cannot be located above public walkways or other

areas where condensate or vapor can cause a

nuisance or hazard

M = Clearance under veranda, porch, deck or

balcony.

12 in (30 cm)‡ 12 in (30 cm)‡

INSTALLATION INSTRUCTIONS

Venting

Venting for Other Than Direct-Vent Water Heater

Regulator vent outlet in the event no

regulator is present, H and I can be

disregarded.

Fixed

closed

15 ft

Fixed

closed

Inside

corner detail

Operable

Horizontal Vent Terminal Location for Other than Direct Vent (Including Outdoor)

The following information should be used for determining the proper location of the vent terminal for water heaters

installed in non-direct vent configurations, including outdoor installations.

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

US Installations

1 In accordance with current CAN/CSA-B149.1, Natural Gas and Propane Installation Code.

2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.

‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

A= Clearance above grade, veranda, porch, deck or

balcony.

12 inches (30 cm) 12 inches (30 cm)

B= Clearance to window or door that may be

opened.

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

4 feet (1.2 m) below or to side of opening; 1 foot

(300 mm) above opening

C= Clearance to permanently closed window.

0 in (0 cm) 0 in (0 cm)

D= Vertical Clearance to ventilated soffit located

above the terminal within a horizontal distance

of 2 feet (61 cm) from the center line of the

terminal.

12 in (30 cm) 12 in (30 cm)

E= Clearance to unventilated soffit. 12 in (30 cm) 12 in (30 cm)

F= Clearance to outside corner. 24 in (61 cm) 24 in (61 cm)

G= Clearance to inside corner. 18 in (46 cm) 18 in (46 cm)

H = Clearance to each side of center line extended

meter/regulator assembly. above

3 feet (91 cm) within a height 15 feet (4.6 m) 3 ft (91 cm) within a height of 15 ft (4.6 m)

I = Clearance to service regulator vent outlet. 3 feet (91 cm) 3 feet (91 cm)

J = Clearance to nonmechanical air supply inlet to

building or the combustion air inlet to any other

appliance..

• 6 in (15 cm) for appliances ≤ 10,000 Btuh

(3 kW),

• 12 in (30 cm) for appliances > 10,000 Btuh

(3 kW) and ≤ 100,000 Btuh (30 kW),

• 36 in (91 cm) for appliances > 100,000 Btuh (30

kW)

4 feet (1.2 m) below or to side of opening; 1 foot

(300 m) above opening.

K = Clearance to mechanical air supply inlet.

6 feet (1.83 m)

3 feet (91 cm) above if within 10 feet (3 m)

horizontally.

L = Clearance above paved side walk or paved

driveway located on public property.

7 feet (2.13 m)

7 ft (2.13 m) for mechanical draft system (Category I

appliances); vents for Category II and IV appliances

cannot be located above public walkways or other

areas where condensate or vapor can cause a

nuisance or hazard

M = Clearance under veranda, porch, deck or

balcony.

12 in (30 cm)‡ 12 in (30 cm)‡

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

Venting

Horizontal Vent Considerations

WARNING:

Moisture in the flue gas will condense as it leaves the vent

terminal. In cold weather this condensate can freeze on the

exterior wall, under the eaves, and on surrounding objects.

Some discoloration to the exterior of the building is to be

expected. However, improper location or installation can

result in severe damage to the structure or exterior finish

of the building.

– DO NOT locate vent terminal on the side of a building

with prevailing winter winds. This will help prevent

water lines from freezing and moisture from freezing on

walls and under eaves.

– DO NOT locate vent terminal too close to shrubbery, as

flue gasses may damage them. A minimum distance of

4 ft. (1.22 m) is recommended.

– All painted surfaces should be primed to lessen the

chance of physical damage. Painted surfaces will

require maintenance.

– Guard against accidental contact with people and pets.

Indoor Tankless Water Heaters

WARNING:

For multiple-unit installations, a minimum distance

between vent terminations must be maintained to prevent

recirculation of vent gases. Maintain a center-to-center

distance between each pair of vent terminations as listed

below:

24 in. (61 cm) for a two-unit installation;

24 in. (61 cm) and 36 in. (91.4 cm) for a three-unit

installation;

24 in. (61 cm), 36 in. (91.4 cm), and 24 in. (61 cm) for a

four-unit installation.

– DO NOT terminate vent directly on brick or masonry

surfaces. Use rust-resistant, sheet-metal backing plate

behind the vent.

– The vent for this appliance shall not terminate

• Over public walkways; or

• Over/Under patios or similar living areas; or

• Near soffit vents or crawl space vents or other area

where condensate or vapor could create a nuisance

or hazard or cause property damage; or

• Where condensate or vapor could cause damage or

could be detrimental to the operation of regulators,

relief valves, or other equipment.

– Caulk all cracks, seams, and joints within

6 ft. (1.8 m) of the vent terminal.

– Caulk around wall faceplate for weather-tight seal.

– DO NOT extend exposed vent pipe of indoor water

heaters outside of the building.

– This water heater requires its own separate venting

system. DO NOT connect the exhaust vent to an existing

vent pipe or chimney.

– Observe minimum clearances. Vent terminals must be a

minimum of 6 inches (17 cm) and a maximum of 24

inches (61 cm) apart horizontally.

Outdoor Tankless Water Heaters

– Install outdoor water heater such that air inlet and flue

outlet are above anticipated snow level.

Rising moisture will collect under eaves.

Inside

Corner

Caulk

If sofﬁt vent is too close,

block off and install new

vent at another location.

6' (1.8 m) Caulk zone or

to edge of window etc.,

starting within 6' (1.8 m)

(1.2 m)

6 11/16” to 24”

(17 cm to 61 cm)

Rising moisture will collect under eaves.

12”

(300 mm)

Inside

Corner

Caulk

If sofﬁt vent is too close,

block off and install new

vent at another location.

6' (1.8 m) Caulk zone

or to edge of window

etc., starting within

6' (1.8 m)

INSTALLATION INSTRUCTIONS

Venting

Horizontal Vent Installation

WARNING:

Danger of fire or bodily injury – Solvent cements and

primers are highly flammable. Provide adequate ventilation

and DO NOT assemble near heat source or open flame. DO

NOT smoke. Avoid skin or eye contact. Observe all cautions

and warnings on material containers.

CAUTION:

Use tankless water heater manufacturer-approved

Schedule 40 PVC (foam core is not permitted at any time),

Schedule 80 PVC, CPVC, ABS or UL 1738-listed Category III

Stainless Steel or PP. No other vent material is permitted.

For Canada, installations must follow ULC S636 for exhaust

venting.

Joining Pipes and Fittings

All pipe, fittings, solvent cement, primers, and

procedures, for the U.S., must conform to American

National Standards Institute and American Society

for Testing and Materials (ANSI/ASTM) standards.

For Canada, all pipe, fittings, solvent cement,

primers, and procedures must conform to ULC-S636

and vent manufacturer specifications.

CAUTIONS:

• DO NOT use solvent cement that has become curdled,

lumpy, or thickened.

• DO NOT thin solvent cement. Observe shelf precautions

printed on the containers.

• For applications below 32°F, use only lower temperature-

type solvent cement.

• Appropriate solvent and cleaner must be used for the

type of vent pipe used (PVC, CPVC, or ABS).

Cleaner-Primer and Medium-Body Solvent

Cement

All joints in vent piping must be properly sealed, and

we recommend using the following material:

PVC materials should use ASTM D-2564-grade

cement.

CPVC materials should use ASTM F-493-grade

cement.

ABS materials should use ASTM D-2235-grade

cement (ABS is not allowed for exhaust vent in

Canada).

Cementing Joints

1. Cut pipe end square; remove jagged edges and

burrs. Chamfer end of pipe and clean fitting socket

and pipe joint area of all dirt, grease, or moisture.

2. After checking pipe and socket for proper fit,

wipe socket and pipe with cleaner-primer. Apply

a liberal coat of primer to inside surface of socket

and outside of pipe.

3. Apply a thin coat of cement evenly in the socket.

Quickly apply a heavy coat of cement to the pipe

and insert pipe into fitting with a slight twisting

motion until it bottoms out.

4. Hold the pipe fitting for 30 seconds to prevent the

tapered socket from pushing the pipe out of the

fitting.

5. Wipe all excess cement from the joint with a rag.

Allow 15 minutes before handling. Cure time will

vary according to fit, temperature, and humidity.

NOTICE:

• Cement must be fluid; if not, recoat with fresh cement.

• Stir the solvent frequently while using. Use a natural

bristle brush or the dauber supplied with the can. The

proper brush size is one inch.

• DO NOT use cement for PP. For proper installation of PP

vent, follow manufactures instrucions.

Exhaust Vent Pipe

12” (30 cm)

Minimum

Air Intake Pipe

Wall Plate

(recommended)

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

Upward Slope

to Termination

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

Horizontal Vent Installation

Fasteners will vary depending on the wall type.

For particle board or

composite sheathing, use

6 hollow wall anchors. The

anchors should be at least

1/8 in. (0.3 cm) in diameter

and the appropriate length

for the sheathing thickness.

For plywood or solid wood

sheathing or members,

use 6 #10 x 1 1/4-in. wood

screws.

For masonry walls, use

suitable masonry anchors

long enough to pass

through the wall.

NOTICE:

• The exhaust vent terminal must extend a minimum of 12

inches (30.5 cm) more than the air intake terminal from

the exterior wall. Also, an edge to edge distance between

an air intake termination and an exhaust termination

shall be at least 12 inches (30.5 cm) for any directions to

prevent recirculation of vent gases.

• To prevent possibility of condensate freeze-up, DO NOT

install vent one above the other or above air intake

termination.

Once the vent terminal location has been

determined, make holes through the exterior wall to

accommodate the vent pipes. Vent pipes must exit

exterior wall horizontally only.

The standard horizontal air intake termination is a

2-inch or 3-inch 90 degree elbow. This prevents rain

or any other liquid for getting into air intake and the

pipe from being pushed back into the structure. The

standard horizontal exhaust outlet termination is a

2-inch or 3-inch pipe which terminates 12 inches

from the air intake termination. Insert a small length

of vent pipe through the wall and connect the

coupling. Connect vent cap or terminal to the vent

pipe on the exterior of the building.

1. Observe minimum clearances. Vent terminals must

be a minimum of 6 11/16 inches (17 cm) and a

maximum of 24 inches (61 cm) apart horizontally.

2. Cut two 2 1/2” (6.4 cm) diameter holes [for a 2”

(5.1 cm) diameter pipe] or 3 1/2” (8.9 cm) diameter

holes [for a 3” (7.6 cm) diameter pipe] for the vent

exhaust and air intake openings.

Apply silicone sealant or silicone/latex caulk to seal

the vent pipe to the vent coupling to permit field

disassembly for annual inspection and cleaning.

Completely seal where it passes through the wall

plate and where it is attached to the structure.

Attach the female end of the next vent pipe section

to the male end of the 2-in./3-in. (5.1-cm/7.6-cm)

vent pipe. See “Cementing Joints” on this Use and

Care Manual.

Insert a 2" PVC pipes slowly into an air intake

connector and a flue connector located on top of the

water heater until they stop. DO NOT use cement.

Tighten 2 locking bands to secure 2" PVC pipes.

Complete the rest of the vent pipe installation to the

water heater's vent exhaust and air intake.

Venting

2” PVC pipes

Locking

bands

INSTALLATION INSTRUCTIONS

Venting

Alternative Horizontal Vent Installations

Alternative horizontal vent termination kits are commercially available. Please refer to the instruction sheet

packaged with the kit for complete installation instructions.

Concentric Vent

Termination Kit

For information about termination kits, refer to "If You Need Service" on page 107, "Call for Assistance"

for the telephone number to speak to a Customer Service Representative.

from wall

is recommended

Upward Slope

to Termination

Exhaust Vent

Pipe

Air Intake

Pipe

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

Flat

Termination

Kit

Air Intake

Vent

Exhaust

Exhaust Vent

Pipe

Air Intake

Pipe

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

Upward Slope

to Termination

Flat Horizontal

Termination Kit

(this termination

can be rotated)

Optional vent diagram (no kit required)

12 in�

(30�5 cm) min�

Terminal assemblies to be parallel to wall�

Front View

Option 2

12 in�

(30�5 cm)

min�

Terminal assemblies to be parallel to wall�

Front View

Option 1

Side View

Termination Openings -

12 in� (30�5 cm) min� above

grade or anticipated snow level

Short piece of pipe

Exhaust

Vent

Terminal

Exhaust

Vent

Terminal

Combustion

Air-Inlet

Terminal

Combustion

Air-Inlet

Terminal

NOTE:

Concentric venting installations may vary pending condensate management. Consult local and regional venting codes.

NOTE:

It is recommended to install exhaust termination higher than air intake to prevent moisture from entering intake pipe.

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Vertical Vent Installation

WARNING:

Improper vent installation can result in death, personal

injury, product damage, and/or poor performance.

NOTICE:

Only Rheem-approved AND for Canada it has tube ULC

S636 approved termination and parts must be used during

installation.

Maintain the recommended air space clearance to

combustible materials and building insulation.

Cut a hole through the roof and interior ceiling to

accommodate the vent pipes.

Insert a 2" PVC pipes slowly into an air intake

connector and a flue connector located on top of the

water heater until they stop. Tighten 2 locking bands

to secure 2" PVC pipes.

Support vertical and horizontal runs as described on

page 24. Vertical supports are required every 4 ft. (1.2

m) along a vertical pipe route, after every transition to

horizontal, and after every offset elbow.

NOTICE:

Free-standing vent pipe that penetrates a roof/ceiling

requires another means of support from a second location.

Determine the vent terminal height and install the

vent pipe accordingly. Refer to “Vertical Vent Terminal

Location” on page 33 for clearance requirements.

Install adequate flashing where the vent pipe passes

through the roof.

Hole

Through Roof

Hole

Through Ceiling

A, B

Venting

2” PVC pipes

Locking bands

INSTALLATION INSTRUCTIONS

Venting

Vertical Vent Terminal Location

A, B

12" Min.

(300 mm)

Vent Pipe

Through Roof

Optional

Air Intake

The following chart with diagrams details the minimum dimensional information needed to determine the proper

location of the vertical vent terminal for direct-vent indoor tankless water heaters:

Location U.S. Installation Requirements

Canadian Installation Requirements

A = Minimum clearance above the roof

level.

12 in. (30 cm) above roof level.

18 in. (45.7 cm) above roof level.

B = Maximum clearance above roof

level (without additional support

for vent pipe).

24 in. (61 cm) above roof level.

C = Required vent clearance from any

gable, dormer, or other roof struc-

ture with building interior access

(i.e., vent, window).

4 ft. (1.2 m)

D = Required vent clearance from any

forced air inlet, including dryer and

furnace air inlets.

10 ft. (3 m)

6 ft. (1.8 m)

E= Minimum horizontal distance be-

tween vent terminals.

6-11/16 in. (17 cm)

1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.

2 In accordance with current CAN/CSA B149.1 Installation Codes.

The vertical intake air termination requires a return

bend or two short or long sweep radius 90° elbows

to keep the inlet downward and prevent entry of rain.

Refer to figure above for the proper location of the air

intake with respect to the exhaust outlet termination.

The vertical exhaust outlet termination is a 2-inch or

3-inch pipe which terminates at least 12 inches (30

cm) above the air intake termination. The exhaust

outlet terminations must be at least 12 inches (30

cm) in US [at least 18 inches (46 cm) in Canada]

above the roof line or anticipated snow levels.

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

Standard Vertical Vent Termination

Venting

Adjustable Roof Flashing

Support Clamp

Upward Slope

Support Hanger

Air Intake

Pipe

Exhaust Vent

Pipe

Optional

INSTALLATION INSTRUCTIONS

Alternative Vertical Vent Termination

Alternative vertical vent termination kits are commercially available. Please refer to the instruction sheet

packaged with the kit for complete installation instructions.

WARNING:

Under no circumstances should the exhaust pipe and the air intake pipe be connected together.

Venting

Support Hanger

Adjustable Roof Flashing

Support Clamp

Air Intake

Pipe

Exhaust Vent

Pipe

Minimum Clearance 18 inches above roof

Concentric Vent Termination

Optional

Upward Slope

NOTE:

Ensure proper condensate management in all vertical venting.

INSTALLATION INSTRUCTIONS

Combustion Air Requirements

Proper operation of the water heater requires air

for combustion and ventilation. Provisions for

combustion and ventilation air must comply with

referenced codes and standards.

Air for Combustion and Ventilation

Air for combustion, ventilation, and dilution of flue

gases for water heater installed in buildings shall

be obtained by indoor combustion air, outdoor

combustion air, or combination indoor and outdoor.

Indoor Combustion Air

The minimum required volume shall be no less than

50 cubic feet per 1000 Btu/hr (4800 cubic cm per

KW) of the aggregate input rating of all appliances

within the space.

Openings used to connect indoor spaces shall be

sized and located in accordance with the following:

(1) Combining spaces on the same story. Each

opening shall have a minimum free area of 1

square inch per 1000 Btu/hr (22 square cm per kW)

of the aggregate input rating of all appliances in

the space but not less than 100 square inches (600

square cm). One opening shall commence within

12" (30 cm) of the top of the enclosure and one

opening shall commence within 12" (30 cm) of the

bottom of the enclosure. The minimum dimension

of air openings shall not be less than 3" (8 cm).

(2) Combining spaces in different stories. The

volumes of spaces in different stories shall be

considered as communicating spaces where such

spaces are connected by one or more openings

in doors or floors having a total minimum free area

of 2 square inches per 1000 Btu/hr (44 square

cm per kW) of the aggregate input rating of all

appliances.

NOTICE:

Power vent (room air) installations in enclosed spaces

with ambient air temperatures exceeding 100 F or ambient

air containing contaminants, such as flammable vapors,

halogenated hydrocarbons, or vehicle exhaust, can result

in reduced performance or, in extreme cases, combustion

errors for the water heater.

If the installation space could become contaminated by

substances such as these, the air intake of the water heater

should be vented to the outdoors.

Outdoor Combustion Air

Outdoor combustion air shall be provided through

opening(s) to the outdoors in accordance with two

permanent opening method or one permanent

opening method. The minimum dimension of air

openings shall not be less than 3" (8 cm).

Two Permanent Openings Method

Two permanent openings, one commencing within

12" (30 cm) of the top of the enclosure and one

commencing within 12" (30 cm) of the bottom of

the enclosure, shall be provided. The openings shall

communicate directly, or by ducts, with the outdoors

or spaces that freely communicate with the outdoors,

as follows:

(1) Where directly communicating with the outdoors

or where communicating to the outdoors through

vertical ducts, each opening shall have a minimum

free area of 1 square inches per 4000 Btu/hr (5.5

square cm per kW) of aggregate input rating of all

appliances in the enclosure.

(2) Where communicating with the outdoors through

horizontal ducts, each opening shall have a

minimum free area of 1 square inches per 2000

Btu/hr (11 square cm per kW) of aggregate input

rating of all appliances in the enclosure.

One Permanent Opening Method

One permanent opening, commencing within 12" (30

cm) of the top of the enclosure, shall be provided.

The water heaters shall have clearances of at least

1" (2.5 cm) from the sides and back and 6" (15 cm)

from the front of the water heaters. The opening

shall directly communicate with the outdoors or shall

communicate through a vertical or horizontal duct to

the outdoors or spaces that freely communicate with

the outdoors and shall have a minimum free area of

the following:

(1) 1 square inches per 3000 Btu/hr (7 square cm per

kW) of the aggregate input rating of all appliances

located in the enclosure

(2) Not less than the sum of the areas of all vent

connectors in the space

FOR YOUR SAFETY

DO NOT store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other

appliance. To do so may result in an explosion or

fire.

This water heater can use room air for combustion

and ventilation as long as the installation complies

with the National Fuel Gas Code, ANSI Z223.1/NFPA

54, and other applicable standards and local codes.

Failure to comply with these standards and other

instructions on the Tankless Water Heater Use and

Care Manual may result in death or serious injury

and/or damage to property.

Installation for Power Vent (Room Air) Application

Venting

INSTALLATION INSTRUCTIONS

Power Vent Installation

Adjustable Roof Flashing

Support Clamp

Support Hanger

Exhaust Vent

Pipe

Optional

Venting

Installation for Power Vent (Room Air) Application

INSTALLATION INSTRUCTIONS

Combination Indoor and

Outdoor Combustion Air

The use of a combination of indoor and outdoor

combustion air shall be in accordance with the

following:

(1) Indoor openings. Where used, openings connecting

the interior spaces shall comply with "Indoor

Combustion Air"

(2) Outdoor opening(s) location. Outdoor opening(s)

shall be located in accordance with "Outdoor

Combustion Air"

(3) Outdoor opening(s) size. The outdoor opening(s)

size shall be calculated in accordance with the

following:

(a) The ratio of the interior spaces shall be the

available volume of all communicating spaces

divided by the required volume.

(b) The outdoor size reduction factor shall be 1

minus the ratio of interior spaces.

be the full size of outdoor opening(s) calculated

in accordance with "Outdoor Combustion Air",

multiplied by the reduction factor. The minimum

dimension of air openings shall not be less than 3"

(8 cm).

Louvers, Grilles, and Screens

The required size of openings for combustion, ventila-

tion, and dilution air shall be based on the net free area

of each opening. Where the free area through a design

of louver, grille, or screen is known, it shall be used in

calculating the size opening required to provide the

free area specified. Where the louver and grille design

and free area are not known, it shall be assumed that

wood louvers have 25 percent free area, and metal

louvers and grilles have 75 percent free area. Nonmo-

torized louvers and grilles shall be fixed in the open

position.

NOTICE:

Protective screening for combustion air inlet MUST NOT be

smaller than 1/4”mesh to prevent clogging by lint or other

debris.

Refer to the latest edition of National Fuel Gas Code,

ANSI Z223.1/NFPA 54 for additional information for the

combustion air requirements.

Corrosive Atmosphere

The water heater should not be installed near an air

supply containing halogenated hydrocarbons where

contaminants can enter the combustion air supply.

Avoid installing a water heater in any of the following

locations: beauty shops, dry-cleaning establishments,

photo processing labs, and storage areas for liquid

and powdered bleaches or swimming pool chemicals.

These locations often contain such halogenated

hydrocarbons.

The air supply containing halogenated hydrocarbons is

safe to breathe, but when passed through a gas flame,

corrosive elements are released that will shorten the

life of any gas-burning appliance.

Propellants from common spray cans or gas leaks

from A/C and refrigeration equipment are highly

corrosive after passing through a flame.

NOTICE:

The water heater warranty is void when the failure is due to

operation in corrosive conditions.

FOR YOUR SAFETY

DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an

explosion or fire.

This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code,

ANSI Z223.1/NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on the

Tankless Water Heater Use and Care Manual may result in death or serious injury and/or damage to property.

INSTALLATION INSTRUCTIONS

Venting

INSTALLATION INSTRUCTIONS

Common Venting for Direct-Vent Water Heater

DANGER:

Failure to properly vent the water heater to the outdoors

as outlined in this Venting section will result in death or

serious personal injury. To avoid the risk of fire, explosion,

or asphyxiation from carbon monoxide, NEVER operate the

water heater unless it is properly vented and has adequate

air supply for proper operation as outlined in this Venting

section.

WARNING:

Refer to page 17 for required clearances to combustible

materials. Improper clearances can cause explosion or fire

resulting in death, personal injury, and/or product damage.

CAUTIONS:

•

Check to make sure flue gases DO NOT recirculate into the

air intake terminal when using direct venting. If the water

heater is having service issues, flue recirculation may be a

contributing factor.

• Even when the minimum vent terminal separation distances

are followed, recirculation may still occur depending upon

the location outside the building, the distance from other

buildings, proximity to corners, weather conditions, wind

patterns, and snow depth.

• Periodically check to make sure that flue recirculation is

not occurring. Signs of flue gas recirculation include frosted

or frozen intake terminals and condensate in the intake

terminal and venting system.

• Correction to flue recirculation may involve angling the

intake away from the exhaust terminal and increasing the

distance between them. Check to be sure the intake and

exhaust terminals are not obstructed, especially during

periods of below-freezing weather.

Venting Requirements

The installation of venting must comply with national

codes, local codes, and the vent manufacturer’s

instructions.

The vent exhaust must terminate outside as described

in these instructions. DO NOT terminate exhaust

pipe or air intake pipe in a chimney. It must be vented

separately from all other appliances.

NOTICE:

The unit with common vent can be vented using only the

following approved vent pipe material.

Use only 3, 4 or 6 inch diameter vent pipe. Use 2 inch

diameter vent pipe to connect a tankless water heater

with the common vent trunk. Refer to local codes for

restrictions on the use of InnoFlue PP, PVC, or CPVC

pipe and fittings. All exhaust venting materials for

product installed in Canada must meet ULC-S636.

The use of cellular core PVC (ASTM F891), cellular

core CPVC, or Radel® (polyphenolsulfone) in non-

metallic venting systems is prohibited and that

covering non-metallic vent pipe and fittings with

thermal insulation is prohibited.

Common venting system shall be in accordance with

the National Fuel Gas Code, ANSI Z223.1/NFPA 54

and/or the CSA B149.1, Natural Gas and Propane

installation Code (Current Editions), local codes, and

the manufacturer’s instructions. This Common vent is

permitted for commercial installation only.

Recommended Vent Lengths

Before starting the vent installation, careful planning

should be given to the routing and termination of the

vent pipes. The length of the vent pipes (air intake and

exhaust) should be kept to a minimum. Also, see pages

26-27 and 31-33 for vent terminal placement. Refer to

the maximum and minimum vent length charts for the

pipe sizes that can be used and the total equivalent

length of pipe that can be used. DO NOT exceed

equivalent length of pipe in maximum vent length chart.

Maximum Vent Length (air intake and exhaust) :

Number of

water heaters

3" Common

Vent

4" Common

Vent

6" Common

Vent

2 60 150 170

3 40 150 170

4 30 70 170

5 25 45 170

6 N/A 35 170

7 N/A 30 170

8 N/A 25 170

9 N/A N/A 95

10 N/A N/A 95

11 N/A N/A 50

12 N/A N/A 50

Venting

All measurements are in feet.

InnoFlue Common Vent Example PVC/CPVC Common Vent Example

These tankless water heaters support the use of common vent systems, but specific vent materials are required.

These heaters can only be common vented with Schedule 40 PVC/CPVC or with the InnoFlue common vent

parts. Please refer to the InnoFlue portion of this manual for those specific parts/kits.

For these particular tankless water heaters, room-air intake installations are allowed.

Please refer to the table below for the maximum allowable vent lengths and the supported amount of tankless

water heaters. DO NOT exceed the equivalent vent length of pipe in the Maximum Vent Length table.

NOTICE:

The InnoFlue common vent system will include a a condensate drain. For PVC/CPVC common vent installations, a condensate

drain is required. The recommend location of that drain is between the end of the last common vent header and start of the

vent run. Installing a system with no condensate drain could negatively impact the system's performance.

Common Venting for Direct-Vent Water Heater

# of Water

Heater

Total Input

Rate (Btu/h)

Vent Diameter

3" 4" 6"

2 399800 60 150 170

3 599700 40 150 170

4 799600 30 70 170

5 999500 25 45 170

6 1199400 N/A 35 170

7 1399300 N/A 30 170

8 1599200 N/A 25 170

9 1799100 N/A N/A 95

10 1999000 N/A N/A 95

11 2198900 N/A N/A 50

12 2398800 N/A N/A 50

INSTALLATION INSTRUCTIONS

Venting

All measurements are in feet.

INSTALLATION INSTRUCTIONS

Venting

Multiple Units Sizing

Installation for Common Vent

Only identical models are allowed to have a common vent. All instructions, requirements, warnings, cautions

and notices described in “Venting” in this Use and Care manual are applicable for a common vent unless they

are specifically mentioned in this section differently.

Total input rate will drop naturally as longer vent length is added. The cold water, hot water, and gas

manifold sizes listed above are the recommended sizes. The size requirements may change based on

water pressure, gas pressure, pressure drop, and other factors at installation site. Adjust these sizes

accordingly for each installation.

Number of 199,900

BTU/h water heaters

Cold Water - Recommended

Manifold Header Size

(Inches)

Hot Water - Recommended

Manifold Header Size

(Inches)

Gas - Recommended

Manifold Header Size

(Inches)

Total Input Rate (Btu/h)

1 1/4

1 1/2

1 1/4

1 1/2

1 1/4

1 1/2

399800

599700

799600

999500

1199400

1399300

1599200

1799100

1999000

Typical Inline Common Vent Installations

Direct Vent

12” min.

3°

NOTE: Condensate

management

required for NRV.

3" pipe only

Condensate Trap

Maximum vent length is

calculated using the longest

vent pipe distance, measured

from the farthest water heater

to the end of the termination

Wall

INSTALLATION INSTRUCTIONS

Venting

2" PVC pipe stub

Hose Clamp

Condensate Trap

3" PVC pipe

2" PVC pipe stub

Y Section

2" to 3" PVC

increaser

2" to 3" PVC

increaser

2" PVC

pipe stub

2" PVC

pipe stub

PVC Exhaust Example

Install a short length of 2” PVC (or CPVC) schedule

40 pipe into an exhaust connection of one of the

tankless water heaters. Tighten a hose clamp to

secure this pipe.

Connect 2” to 3” PVC increaser, and connect 3”

PVC pipe. Install and connect 2” PVC pipe, 2” to 3”

PVC increaser, and 3” PVC pipe into the other water

heater.

Connect 3” PVC pipes by T connection or Y

connection, add vent pipes, and terminate on an

outside wall as other section in this Use and Care

manual instructed.

PVC Air Intake Example

Install a short length of 2” PVC (or CPVC) schedule

40 pipe into an air intake connection of one of the

tankless water heaters. Tighten a hose clamp to

secure this pipe.

Connect the condensate trap and additional 2"

pipe stub to the existing pipe. Add the 2” to 3” PVC

increaser, and connect the 3”PVC pipe. Install and

connect these parts into the other water heater.

Connect 3” PVC pipes by T connection or Y

connection, add vent pipes, and terminate on an

outside wall as other section in this Use and Care

manual instructed.

Installation for Common Vent

2" PVC pipe

stub

INSTALLATION INSTRUCTIONS

The following inline header vent kits can be purchased separately to create inline common venting system:

These kits contain only minimum required vent parts to create a common venting trunk line and a connection

from the trunk line to water heaters. Vent parts included in these kits DO NOT count for equivalent vent length.

Additional vent parts will be required to complete the common venting system. Refer to the “Parts Ordering”

section of this installation instructions for additional information and a itemized lists for each kit.

These extender kits should be purchased with an inline header vent kit. Vent parts included in these kits DO

NOT count for equivalent vent length except a 87 degree elbow for the air intake included in a room air kit.

Additional vent parts will be required to complete the common venting system. Refer to the "Parts Ordering"

section of this installation instructions for additional information.

NOTICE:

These common vent parts have been specifically designed to be compatible with the heater spacing of the Tankless

Rack Systems. To create a 3-degree slope in the exhaust common venting, the straight pipe parts should be cut to

have a 1.1 inch difference.

If a Tankless Rack System is not being utilized, it is recommend that the same heater spacing being maintained.

By maintaining the same spacing, the 1.1" straight pipe difference will create the 3-degree slope. Please refer to

pages 53 and 54 for that spacing.

Rheem Part Number Part Description

RTG20353A 6" Inline Starter Exhaust Kit

RTG20354A 6" Inline Extension Exhaust Kit

RTG20353B 6" Inline Starter Intake Kit

RTG20354B 6" Inline Extension Intake Kit

The following back to back header vent kits can be purchased separately to create back to back common

venting system:

Rheem Part Number Part Description

RTG20351A 6" Back to Back Starter Exhaust Kit

RTG20352A 6" Back to Back Extension Exhaust Kit

RTG20351B 6" Back to Back Starter Intake Kit

RTG20352B 6" Back to Back Extension Intake Kit

Venting

Common Vent Parts - InnoFlue™

Exhaust

Air Intake

Rheem Part Number Part Description

1 RTG20350C 6" Inline Exhaust Branch Tee

2 RTG20361 2" Straight Pipe, 2'

3 SP21092G 2" Connector Ring

4 RTG20365 2", 87 Degree Elbow

5 SP10918AG 6" Horizontal Drain Fitting

6 SP20918C Universal Ball Valve Siphon

7 RTG20350D 6" Inline Intake Branch Tee

8 RTG20359 2", 45 Degree Elbow

9 SP20918AH 6" Tee Cap

Venting

Common Vent Parts - InnoFlue™

INSTALLATION INSTRUCTIONS

Rheem Part

Number

Part Description

1 RTG20350A

6" Back to Back

Exhaust Branch Tee

2 RTG20360 2" Straight Pipe, 1'

3 SP21092G 2" Connector Ring

4 RTG20359 2", 45 Degree Elbow

5 SP20918AG

6" Horizontal Drain

Fitting

6 SP20918C

Universal Ball Valve

Siphon

7 RTG20350B

6" Back to Back Intake

Branch Tee

8 SP20918AH 6" Tee Cap

Common Vent Parts - InnoFlue™

Exhaust

Air

Intake

Venting

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Exhaust Vent

Pipe

Air Intake

Pipe

Wall plate

Inspection

Access Panel

(Optional)

Air Intake

Pipe

Wall Plate

Inspection

Access Panel

(Optional)

Ceiling

Upward Slope

to Termination

Exhaust Vent

Pipe

Termination

Tee

Ceiling

Upward Slope

to Termination

12”-24”

(31cm-61cm)

Min 36” (91cm)

Max 20’ (6.1m)

6”-12”

(15cm - 31 cm)

36”

(91cm)

36”

(91cm)

Air intake

Exhaust

Termination Tee

AREA WHERE AIR INTAKE

IS NOT PERMITTED

Joint Connections

• Each female-end of every InnoFlue® vent length or

component features a factory installed gasket. Before

assembly, make sure gaskets are in place correctly.

• Measure the depth of the female socket. Mark the

male-end of each component just shy of the depth

of the female socket from its end.

• Place a thin layer of Centrocerin, a water based

lubricant onto the male end of component 2 for ease

of assembly.

• Slip a Connector Ring over the male end of

component 2 so that it can grip the gasket bead of

component 1.

• Push and twist male end until properly seated in

component 1, aligning the mark with the top of the

female end.

• Clip the Connector Ring onto the gasket bead to

secure the two components to each other. Rotate

the “hook” to the side or bottom of the joint to

facilitate visual checks.

NOTICE:

To meet requirements of ULC-S636 & UL-1738, only

InnoFlue® Vent Systems of 2", 3", 4" and 5" diameters

must utilize Connector Rings.

Inline Exhaust Vent Kit Installation

Instructions

After the water heaters have been mounted securely

and have 21.75" (55.2 cm) center to center distance,

start assembling the common venting system.

Sparingly apply Centrocerin to the gasket or male

end of vent pipe for ease of assembly.

Install a 2" PP straight pipe on the top of the water

heaters.

Connect a feeder of a branch tee to a 87° elbow for

inline installation.

Component 1 Component 2

Venting

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Connect the branch tee to another branch tee.

Repeat steps 4 and 5 until all exhaust branch tees

are connected.

Connect the open end of the elbow to the open end

of the 2” straight pipe. Repeat this step until all 2”

straight pipes are connected.

Connect a horizontal drain fitting to the end of the

exhaust common vent trunk line.

Connect a ball siphon to the horizontal drain fitting.

INSTALLATION INSTRUCTIONS

Venting

Inline Air Intake Kit

Installation Instructions

Sparingly apply Centrocelin included in the vent kit

to the gasket or male end of vent pipe to assemble

the common venting system easily.

Connect a feeder of a branch tee to the open end of

the 45 degree (please use degree symbol) elbow.

Connect the branch tee to another branch. Repeat

steps 1 and 2 until all air intake branch tees and

elbows are connected.

Connect the open end of the elbow to the top of

the water heater. Repeat this step until all of the

adapters or the elbows are connected.

Connect a tee cap to the end of the air intake

common vent trunk line.

CAUTION:

Use Rheem approved InnoFlue® PP. For Canada,

installations must follow ULC-S636 for exhaust venting.

Also, all pipe, fittings and procedures must conform to ULC-

S636 and vent manufacturer specifications.

NOTICE:

DO NOT use cement for InnoFlue® PP.

INSTALLATION INSTRUCTIONS

Venting

Venting for Direct-Vent Water Heater

Joint Connections

• Each female-end of every InnoFlue® vent length or

component features a factory installed gasket. Before

assembly, make sure gaskets are in place correctly.

• Measure the depth of the female socket. Mark the

male-end of each component just shy of the depth

of the female socket from its end.

• Place a thin layer of Centrocerin, a water based

lubricant onto the male end of component 2 for ease

of assembly.

• Slip a Connector Ring over the male end of

component 2 so that it can grip the gasket bead of

component 1.

• Push and twist male end until properly seated in

component 1, aligning the mark with the top of the

female end.

• Clip the Connector Ring onto the gasket bead to

secure the two components to each other. Rotate

the “hook” to the side or bottom of the joint to

facilitate visual checks.

NOTICE:

To meet requirements of ULC-S636 & UL-1738, only

InnoFlue® Vent Systems of 2", 3", 4" and 5" diameters

must utilize Connector Rings.

Back to Back Exhaust

Vent Kit Installation Instructions

After the water heaters have been mounted securely

and have 21.75" (55.2 cm) center to center distance,

start assembling the common venting system.

Sparingly apply Centrocerin to the gasket or male

end of vent pipe for ease of assembly.

Install a 2" PP straight pipe on the top of the water

heaters.

Connect a feeder of a branch tee to a 45° elbow. An

unused feeder should be close by a tee cap.

Component 1 Component 2

INSTALLATION INSTRUCTIONS

Venting

Connect the branch tee to another branch tee.

Repeat steps 2 and 3 until all exhaust branch tees

are connected.

Connect the open end of the elbow to the open end

of the 2” straight pipe. Repeat this step until all 2”

straight pipes are connected.

Connect a horizontal drain fitting to the end of the

exhaust common vent trunk line

Connect a ball siphon to the horizontal drain fitting.

Venting for Direct-Vent Water Heater

INSTALLATION INSTRUCTIONS

Venting

Venting for Direct-Vent Water Heater

Back to Back Air Intake

Installation Instructions

Sparingly apply Centrocelin included in the vent kit

to the gasket or male end of vent pipe to assemble

the common venting system easily.

Connect a feeder of a branch tee to a 45° elbow. An

unused feeder should be closed by a tee cap.

Connect the branch tee to another branch. Repeat

steps 1 and 2 for direct vent until all air intake branch

tees are connected.

Connect the open end of the elbow to the top of the

water heater. Repeat this step until all of the elbows

are connected.

Connect a tee cap to the end of the air intake

common vent trunk line.

CAUTION:

Use Rheem approved InnoFlue® PP. For Canada,

installations must follow ULC-S636 for exhaust venting.

Also, all pipe, fittings and procedures must conform to ULC-

S636 and vent manufacturer specifications.

NOTICE:

DO NOT use cement for InnoFlue® PP.

INSTALLATION INSTRUCTIONS

Venting

Horizontal Vent Installation

To extend the exhaust common vent trunk line and

the air intake common vent trunk line to outside,

additional InnoFlue® PP and PVC is required. Refer

to "Parts list" for additional information.

Once the vent terminal location has been

determined, make a hole or holes through the

exterior wall to accommodate the vent pipes,

Vent pipes must exit exterior wall horizontally only.

Connect a bird screen or a termination tee to the

common venting on the exterior of the building.

Observe minimum clearances. An exhaust common

vent termination and an air intake common vent

termination have a minimum 36 inches (91 cm)

edge to edge clearance and a maximum 20 feet

(6.1 m) edge to edge clearance. Consider other

clearances as well. Refer to page 28-35 for additional

information.

Cut one or two holes for the exhaust common vent/

air intake common vent. Diameter of the hole(s)

should be 0.5” (1.3 cm) or slightly larger than

common vent pipe.

Extend the exhaust common vent/air intake common

vent and terminate 12"-24" (31cm-61cm) beyond

the exterior of the building. Support vertical and

horizontal runs as described on page 24.

Add a 87 degree elbow into an air intake termination

to prevent rain, condensate or other liquid from

entering into the water heaters. Without the 87

degree elbow, property damage will occur. A 87

degree elbow is not required if air intake pipe has an

offset, but the air intake pipe shall have downward

slope toward outside to drain rain, condensate or

other liquid.

Completely seal where the common vent passes

through the wall plate and where it is attached to the

structure. DO NOT support, pin or otherwise secure

the common vent in such a way that restricts the

normal thermal expansion and contraction of the

common vent.

Min 36” (91 cm)

Max 20’ (6.1 m)

Exhaust Vent

Air Intake Vent

Common Vent Pipe

12”-24”

(31cm - 61cm)

Hole should be 0.5” (1.3 cm) or larger than vent pipe

Min 36” (91 cm)

Max 20’ (6.1 m)

Exhaust Vent

Air Intake Vent

Common Vent Pipe

12”-24”

(31cm - 61cm)

Hole should be 0.5” (1.3 cm) or larger than vent pipe

Min 36” (91 cm)

Max 20’ (6.1 m)

Exhaust Vent

Air Intake Vent

Common Vent Pipe

12”-24”

(31cm - 61cm)

Hole should be 0.5” (1.3 cm) or larger than vent pipe

Venting for Direct-Vent Water Heater

INSTALLATION INSTRUCTIONS

Venting

INSTALLATION INSTRUCTIONS

Venting

Typical Common Vent Installations

Typical Inline Common Vent Installations

Direct Vent

Power Vent (Room Air Application)

3 Degree upward

slope toward outside

To suitable drain

3°

Wall

12” - 24” (31 cm – 61 cm)

Min 36”

(91cm)

Max 20’

(6.1m)

21.75" (55.2 cm)

3 Degree upward

slope toward outside

To suitable drain

Wall

12” - 24”

(31 cm – 61 cm)

21.75" (55.2 cm)

FOR YOUR SAFETY

DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an explosion

or fire.

This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code, ANSI Z223.1/

NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on the Common Vent

Installation Instructions and the Tankless Water Heater Use and Care Manual may result in death or serious injury and/or damage to property.

ABCDE

2345

Inline - Exhaust

Heater # Letter Length

1 A 17.1

2 B 18.2

3 C 19.3

4 D 20.4

5 E 21.5

6 F 22.6

7 G 23.7

8 H 24.8

9 I 25.9

10 J 27

11 K 28.1

12 L 29.2

Straight Pipe Length

Starter Kit 24"

Extension Kit 36"

For the heater spacing specified in the above image, the straight pipe parts

should be cut to have a 1.1 inch difference. That difference in length will create the

3-degree slope of the exhaust vent, as pictured.

Typical Common Vent Installations

Typical Back to Back Common Vent Installations

Direct Vent

Power Vent (Room Air Application)

FOR YOUR SAFETY

DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an explosion or

fire.

This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code, ANSI Z223.1/

NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on the Common Vent

Installation Instructions and the Tankless Water Heater Use and Care Manual may result in death or serious injury and/or damage to property.

3 Degree upward

slope toward outside

To suitable drain

3°

Wall

12” - 24” (31 cm – 61 cm)

Min 36”

(91cm)

Max 20’

(6.1m)

21.75" (55.2 cm)

3 Degree upward

slope toward outside

To suitable drain

3°

21.75" (55.2 cm)

Wall

12” - 24” (31 cm – 61 cm)

INSTALLATION INSTRUCTIONS

Venting

Back to Back - Exhaust

Heater # Letter Length

1 & 2 A 10.1

3 & 4 B 11.2

5 & 6 C 12.3

7 & 8 D 13.4

9 & 10 E 14.5

11 & 12 F 15.6

Straight Pipe Length

Starter Kit 12"

Extension Kit 24"

1 3 5

B C

4 6

For the heater spacing specified in the above image, the straight pipe parts should be cut to have a 1.1 inch

difference. That difference in length will create the 3-degree slope of the exhaust vent, as pictured

For installation of multiple water heaters, ensure proper manifolding of the controls and common venting as outlined in the

section below. Note that up to 20 water heaters can have manifolded gas lines, water lines, and controls, however, vent pipes

can only be common vented for a maximum of 12 water heaters. For more than 12 water heater installations, multiple vent

runs will be required. For manifold systems with built-in recirculation pump, the first water heater in the series must contain

the built-in recirculation pump to ensure proper operation. Additional water heaters in the series can be recirculation or non-

recirculation based on application requirements.

This water heater includes multiple unit controls

to manifold up to 20 water heaters together.

To accomplish multiple unit controls, a RJ25

communication cable(s) is required. Contact a store

where tankless water heaters were purchased to

purchase the RJ25 communication cable(s).

When multiple unit controls are used, one unit

will be used to control the settings for all heaters.

This unit will have a network instance of 1, and

will display "MANAGER" on the control display

during operation. This unit should be the only

model connected to WiFi. If some, but not

all, of the manifolded heaters contain a built-

in recirculating pump, the manager unit must

contain the built-in recirculating pump.

Additionally, one unit will display "STARTER"

on the control display during operation. This

identifies the unit that will activate first during

use of the manifolded water heaters. This

designation will rotate between the different

manifolded water heaters periodically to

ensure even usage. When the manager unit is

selected as the starter unit, it will display "MGR/

STARTER" instead.

Turn off water and gas.

Remove screw covers, 4 screws, and a front cover for

all water heaters.

Connect all water heaters by the RJ25 Communication

Cable(s). The RJ25 Communication Cable(s) should go

through a rubber grommet on the bottom of the water

heater, and be attached to one of the connectors on

the right side of the display. The other end should be

attached to another water heater.

Go to a display on one of the units, and press

“SETTINGS”.

Press the “▼” or “▲” button until “NETWORK

INSTANCE” is displayed, and press “ENTER” to

confirm.

INSTALLATION INSTRUCTIONS

Multiple Unit Controls

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

NETWORK INSTANCE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

NETWORK INSTANCE

Rubber Grommet

RJ25

Communica-

tion Cable

Suggested RJ25 Communication Cables

Part Number Length

RCPN-AMP03-0013111101-003 48"

RCPN-AMP03-0013111101-002 72"

RCPN-AMP03-0013111101-004 240"

Multiple Units

Press the “▼” or “▲” button for several times to assign

a unique and sequential instance number to the unit,

and press “ENTER” to confirm. Repeat steps 4 through

6 until all manifolded units are assigned to a unique

instance number.

Go to a display on a unit with “INSTANCE” = 1, and

press “SETTINGS”. When running multiple units

together in manifold, the "INSTANCE = 1" unit should

be the only unit connected to WiFi.

Press the “▼” or “▲” button until “Tankless Config”

is displayed, and press “ENTER” to confirm.

Press the “▼” or “▲” button until “Manifold Heaters”

is displayed, and press “ENTER” to confirm.

Press the “▼” or “▲” button to set a number of

manifolded water heaters, and click “ENTER” to

confirm.

Confirm the label “STARTER” is visible on the display

of unit instance 2, and “MANIFOLD #*” is visible on

the display of all other units, where the manifold

number corresponds to the unit's instance number. If

set up is not completed properly and you don’t see

the text, repeat steps 3 through 10.

* For certain models, this may list "MASTER", instead of

"STARTER".

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

STARTER

Multiple Unit Controls (cont.)

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Manifolded Heaters

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Manifolded Heaters

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Manifolded Heaters

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Manifolded Heaters

SETTINGS

BACK ENTER

STATUS SERVICE MODE

NETWORK INSTANCE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

NETWORK INSTANCE

INSTALLATION INSTRUCTIONS

Multiple Units

Multiple Unit Controls (cont.)

Instance 1 will remain with the text “MANAGER”

displayed on the main screen. Only Instance 1 is

used to control the set point of all the manifolded

units.

* For certain models, this may list "SET POINT", instead of

"MANAGER".

Install the front cover, 4 screws and the screw covers

for all water heaters.

Turn on water and gas.

SETTINGS

BACK ENTER

STATUS SERVICE MODE

MANAGER

INSTALLATION INSTRUCTIONS

Multiple Units

INSTALLATION INSTRUCTIONS

Manifolded Water Heaters with Zoned

Recirculation Setup

Hot Water Fixtures

Expansion

Tank

Gas

Hot Water

Cold Water

Check Valve (Recommended)

Gate/Ball Valve

Multiple Units

INSTALLATION INSTRUCTIONS

Water Supply

CAUTION:

This water heater MUST ONLY be used with the following

water supply conditions to prevent product damage and

operation failure.

• Clean, potable water free of corrosive chemicals, sand,

dirt, and other contaminates.

• Inlet water temperatures above 32°F (0°C), but not

exceeding 120°F (49°C).

• DO NOT reverse the HOT and COLD water connections.

• DO NOT connect this water heater to water lines

previously used for space heating. All water piping and

components shall be suitable for potable water.

• With recommended water quality (See chart above).

Water Quality

Plumbing

Water Supply

Water quality must be taken into account when

installing and maintaining the water heater. Water

conditions outside of the levels specified below

affect and may damage the water heater. Please

note that the limited warranty provided with the

water heater does not cover defects, malfunctions

or failures resulting from water conditions that are

not in accordance with the specifications in the table

below

If you nonetheless install this water heater where the

water conditions are not within the levels specified in

the table below, Rheem recommends that you take

the following steps:

Install a water treatment device or water softener at

the same time as the original installation of the water

heater. Rheem offers a water treatment accessory

that can be installed with the water heater. (See

below).

Flush the water heater’s heat exchanger regularly.

Rheem offers a flush kit and isolation valves to help

remove scale build up. (See below)

Chart for Recommended Water Quality Levels

(Total Dissolved

Solids) TDS

Free Carbon

Dioxide (CO

)

Total

Hardness

Aluminum Chlorides Copper Iron Manganese Zinc

6.5–8.5 Up to 500 mg/L Up to 15 mg/L

Up to

200 mg/L

0.05 to

0.2 mg/L

Up to

250 mg/L

Up to

1.0 mg/L

Up to

0.3 mg/L

Up to

0.05 mg/L

Up to

5 mg/L

Cited reference: National Secondary Drinking Water Regulations

Accessory Kit Replacement Filter Tankless Flush Kit Tankless Isolation Valve

AllClear Water Treatment Kit RTG20251 RTG20252

RTG20124 RTG20220AB

Accessory part numbers listed below. See Parts and Accessories Catalog for more information.

Plumbing

Water Supply Connections

CAUTION:

IMPORTANT—DO NOT apply heat to the HOT or COLD water

connections. If sweat connections are used, sweat tubing

to the adapter before fitting the adapter to the water

connections on the water heater. Any heat applied to the

water supply fittings will permanently damage the internal

components of the water heater.

NOTICE:

In cold environments, ice can accumulate in the water

heater’s connectors. Plug in the water heater power

cord for approximately 10 minutes before making these

connections. This will melt any ice buildup.

Plumbing should be carried out by a qualified plumbing

contractor in accordance with local codes.

Only use approved plumbing materials.

To allow the full flow capacity, it is recommended to keep

water inlet and outlet pipes 3/4" (1.9 cm) diameter or larger.

To conserve energy and to prevent freezing, insulate both

COLD and HOT water supply lines. DO NOT insulate the

drain line or pressure-relief valve.

Recirculation

Direct recirculation is allowed, provided the loop is

thermostatically controlled, and a timer is used to turn

the pump off during off peak periods. The pump must be

sized for a minimum of 5 gpm at 25 ft of head plus building

head. A 10°F difference between the loop thermostat

setting and water heater temperature setting must be

maintained.

For recirculation without a dedicated return line, a

thermal bypass (crossover) valve may be used at the

farthest faucet. For this type of installation, it is strongly

recommended to use a Rheem approved valve to ensure

optimal performance and reliability. Refer to Recirculation

Control With Thermal Bypass (Crossover) Valve for the full

list. See thermal bypass (crossover) valve instructions for

installation details.

To ensure proper operation of the water heater, follow

these water pressure guidelines.

Operation of the water heater requires a minimum water

pressure of 14 psi (97 kPa) and a minimum water flow rate

of 0.4 gpm (1.5 lpm).

Water pressure of 65 psi (448 kPa) is required to achieve

maximum flow rate.

To maintain proper performance, there must be sufficient

water supply pressure. Required Water Pressure =

Min. Operating Water Pressure (14 psi [97 kPa])

+ Pipe Pressure Loss

+ Faucet Pressure Loss

+ Safety Margin (more than 5 psi [34 kPa]).

To supply HOT water to upper floors, additional water

pressure will be required (0.44 psi [3 kPa] per foot of

height). Calculate the distance between the water inlet of

the water heater (ground level) to the HOT water faucet

farthest away from the water heater (upper floor level).

Well water systems should be set to ensure a minimum

system pressure of 65 psi (448 kPa). The pressure should

remain constant and stable during the operation of the

water heater.

Gravity water pressure is not recommended. When the

water is supplied from a water supply tank, the height

of the tank, the diameter of the supply pipes, and

their relation to water pressure need to be taken into

consideration.

Thermal Expansion [Heating or recirculation application]

Determine if a check valve exists in the inlet water line.

Check with your local water utility company. It may

have been installed in the cold water line as a separate

back flow preventer, or it may be part of a pressure

reducing valve, water meter or water softener. A check

valve located in the cold water inlet line can cause what

is referred to as a “closed” water system. A cold water

inlet line with no check valve or back flow prevention

device is referred to as an “open” water system. As

water is heated, it expands in volume and creates an

increase in the pressure within the water system. This

action is referred to as “thermal expansion”. In an “open”

water system, expanding water and the resulting

pressure increase which exceeds the capacity of the

water heater, flows back into the city main where the

pressure is easily dissipated.

A “closed” water system, however, prevents the

expanding water from flowing back into the main

supply line, and the result of “thermal expansion” can

create a rapid and dangerous pressure increase in the

water heater and system piping. This rapid pressure

increase can quickly reach the safety setting of the

relief valve, causing it to operate during each heating

cycle. Thermal expansion, and the resulting rapid and

repeated expansion and contraction of components

in the water heater and piping system can cause

premature failure of the relief valve, and possibility the

heater itself.

NOTE:

All recirculation loops are "closed" water systems and

require thermal expansion tank.

NOTICE:

Replacing the relief valve will not correct the problem!

The suggested method of controlling thermal expansion

is to install an expansion tank in the cold water line

between the water heater and the check valve.

The expansion tank is designed with a built-in air

cushion that compresses as the system pressure

increases. This relieves the over-pressure condition and

eliminates the repeat operation of the relief valve. For

other approved methods of thermal expansion, contact

an installing contractor, water supplier, or plumbing

inspector.

INSTALLATION INSTRUCTIONS

Water Supply Installation

NOTICE:

• Use only Teflon tape on all COLD and HOT water

connections.

• If the water flow resistance of a showerhead is too high,

the burner in the water heater will fail to ignite. Keep

all showerheads clean from debris that could cause

additional pressure drop.

• If using mixing valves on the outlet, choose one that

prevents COLD water pressure from overcoming HOT

water pressure.

• If multiple water heaters are installed in a manifold

system, the water piping MUST be in “parallel” and the

water pressure at each water heater should be 65 psi

(448 kPa).

Install a COLD water shut-off service valve on the

inlet line of the water heater. This valve will be used

for servicing and draining purposes.

NOTICE:

It is not recommended to use pipes with smaller diameters

than the water supply connection of the water heater.

Before attaching the water line to the water heater,

open the shut-off valve. Run the water until it has

purged all contaminants (sand, debris, air, caulking,

etc.) from piping and fittings.

Install a service valve or shut off valve at the end of

the COLD water supply line and connect it to the

water inlet on the water heater.

Open the shut-off valve in the COLD water Inlet line

to check the water flow through the water heater.

Close the shut-off valve and remove, clean, and

replace the water filter.

NOTICES:

• Be sure to connect the COLD water inlet and the HOT

water outlet as shown on the water heater. If reversed,

the water heater will not function.

• The flow rate of HOT water may vary when more than

two faucets (e.g. appliances, fixtures, etc.) are being used

simultaneously.

• The pipes MUST be completely drainable. If the HOT water

faucets are located at a point higher than the water

heater, place a drain valve at the lowest point.

It is recommended to use unions and flexible copper

connections at the COLD and HOT water lines. They

allow the water heater to be disconnected easily for

servicing.

Use the following guidelines when connecting the

HOT WATER OUTLET:

Connections between the water heater and point(s)

of use should be as short as possible.

Local codes shall govern the piping used for water

connections.

To conserve energy and to prevent freezing, insulate

both COLD and HOT water supply lines. DO NOT

insulate drain line or pressure-relief valve.

INSTALLATION INSTRUCTIONS

Plumbing

Relief Valve

A new pressure-relief valve, complying with the

Standard for Relief Valves and Automatic Gas

Shut-Off Devices for Hot Water Supply Systems,

ANSI Z21.22/CSA 4.4, must be installed at the HOT

water outlet connection of the water heater during

installation. Local codes shall govern the installation

of any relief valve.

NOTICE:

• The following drawing illustrates a pressure-only relief

valve. If local codes require a combination temperature

and pressure-relief valve, you may need to install an

extension piece to ensure that the valve probe is not

directly in the flow path of the water.

•

A pressure relief valve must be installed as shown below.

• Manual operation of relief valves should be performed at

least once a year.

• If a relief valve discharges periodically, this may be due

to thermal expansion in a closed water supply system.

Contact the water supplier or local plumbing inspector

on how to correct this situation. Do not plug the relief

valve. Turn off the water heater, unplug the unit, and call

for service.

One end of the relief valve discharge line connects

to the HOT water outlet pipe as shown above. The

other end of the pipe should be routed to a suitable

drain to eliminate potential water damage.

For safe operation of the water heater, be sure that:

The pressure rating of the relief valve must not

exceed 150 psi (1,034 kPa) or the maximum working

pressure of the water heater. (See the rating plate on

the water heater.)

The BTUH rating of the relief valve must equal or

exceed the BTUH input of the water heater. (See the

rating plate on the water heater.)

No valve of any type should be installed between the

relief valve and the water heater.

Discharge from the relief valve should be piped to

a suitable drain. Piping used should be of a type

approved for the distribution of hot water.

HOT and COLD water lines should be insulated up to

the water heater. See "Water Supply Installation".

The discharge line must be NO SMALLER than the

outlet of the relief valve. The drain line must pitch

downward to allow for complete drainage of the line

and the valve.

The end of the discharge line should not be threaded

or concealed and should be protected from freezing.

No valve of any type, restriction, or reducer coupling

should be installed in the discharge line.

Plumbing

INSTALLATION INSTRUCTIONS

Water Piping Arrangement With Service Valve Kit

Service valve kits can attach to all tankless water

heater systems. All kits include two full-port isolation

valves to be used in the COLD and HOT water lines.

When installed, these valves allow one person full

diagnostic testing and ease of flushing the system.

Contact your distributor or place of purchase for

availability and installation information.

Water

Inlet

Water

Outlet

Pressure

Relif Valve

Drain

Cold

Water

Service

Valve

Hot

Water

Service

Valve

Water

Inlet

Water

Outlet

Pressure

Relif Valve

Drain

Cold

Water

Service

Valve

Hot

Water

Service

Valve

INSTALLATION INSTRUCTIONS

WARNINGS:

• When pipe insulation is not rated for the appropriate

weather conditions, install electric heat tracing or

equivalent to prevent freezing of the pipes.

• DO NOT insulate or block drain valve on the hot outlet

fitting.

• If pipes are allowed to freeze, the water heater and the

pipes may malfunction or leak due to freezing water.

NOTICE:

The hot and cold water supply pipes should be insulated to

provide additional freeze protection.

For increased energy efficiency, use pipe insulation

as shown in the diagram. Insulate the pipes all the

way to the top. DO NOT cover any drain or pressure-

relief valve(s).

Hot and Cold Pipe Insulation Installation

Condensate Drainage

It is recommended to install an external neutralizer.

Contact a store where this water heater is purchased

to purchase an external neutralizer.

WARNING:

The condensate coming from the water heater is known

to be acidic. Without an external neutralizer, metals

contacting the condensate can be corroded.

Be sure the condensate runs freely to a drain and is

not blocked. In cold climates, precautions may need

to be taken to ensure that the condensate drain does

not freeze.

All condensation must be drained and disposed of

per local codes and requirements.

Use only PVC or CPVC pipe or flexible tube for the

condensate drain line.

The drain pipe (along its entire length) must be at

least the same diameter as the drain line.

The drain line should be as short as possible and

have a downward slope toward the end.

The end of the drain pipe should be open to the

atmosphere. The end should not be under water or

other substances.

DO NOT connect the drain pipe directly to the drain

sewer.

Condensate

Plumbing

Pressure

Relief

Valve

Hot Water

Service

Valve

Cold Wa-

ter Service

Valve

Water Inlet

Water Outlet

Drain

Condensate Drain

Recirculation

return ﬁtting

(Available

only on cer-

tain models)

Condensate Drain

Gas Supply

INSTALLATION INSTRUCTIONS

Gas Supply System

WARNING:

DO NOT attempt to convert this water heater for use with

a different type of gas other than the type shown on

the rating plate except the conversion following “Fuel

Conversion Instructions”. Doing so could result in death,

personal injury, explosion or fire, product damage, and/or

poor operating conditions or performance.

NOTICE:

• Gas piping shall be in accordance with local utility

company requirements and/or in the absence of local

codes, use the latest edition of National Fuel Gas Code

(NFGC), ANSI Z223.1. In Canada, use the latest edition of

CAN/CSA B149.1, Natural Gas and Propane installation

code.

• Apply a thin coat of pipe compound to all threaded male

ends. Compound must be of the type resistant to the

action of LP gas.

• To ensure proper water heater operation, the gas pipe

and gas meter must be sized correctly.

• If flexible connectors are used, the minimum inside

diameter must be 3/4" or greater and the rated capacity

of the connector must be equal to or greater than the

BTU capacity of the water heater. See manufacturer

information for the gas connector. Lengths over 36

inches are not recommended.

• DO NOT use excessive force when tightening the pipe

sections. Excessive force can damage the water heater,

especially when Teflon pipe compound is used.

Gas Supply

Gas Piping

Pipe-Sizing Procedure – The gas supply system

must be properly sized to ensure the proper

operation of this tankless water heater as well as all

the gas appliances on the system. Failure to ensure

the gas system, (meter, regulators, and piping) are

properly sized could result in improper operation

of this or other gas appliances. Insufficient gas

pressure/supply can cause ignition failures,

lockouts, or operating conditions that could lead to

an appliance failure, improper combustion, carbon

monoxide, sooting, or fire. Gas line sizing is based

on gas type, the pressure drop in the system, the

gas pressure supplied, and the gas line type. For

gas pipe sizing in the United States, refer to the

National Fuel Gas Code, (NFPA 54, ANSI Z223.1).

For Canadian gas pipe sizing, refer to the Natural

Gas and Propane Installation Code CAN/CSA

B149.1.

These simplified instructions only address low

pressure gas systems using Schedule 40 Metallic

Pipe (Black Iron). These instructions do NOT apply

to hybrid gas systems, high pressure main lines

with regulators at the appliance, gas systems piped

with corrugated stainless steel tubing (CSST), or

Propane gas systems. Please refer to local codes

when sizing these systems.

Determining the required

regulator and gas meter size.

Find the BTU capacity of each appliance on the

system. This information is located on a rating label

attached to the appliance. Total the BTU of all the

appliances together and divide that by the heating

value of the fuel (for natural gas the average is 1,024

or 2,546 for propane). This will give you the total

cubic feet per hour of gas required for the system.

At your gas meter/regulator there will be a rating

plate that gives the cubic feet per hour capacity

of that equipment. If the total gas required for the

system is greater than the rating of the meter/

regulator then the local gas company will need

to be contacted in order to upgrade the meter/

regulator for the system.

Cubic Feet

Per Hour (CFH) =

Gas Input of

Water Heater (BTU/HR)

Heating Value of Gas (BTU/FT

)

Manual Gas

Supply Line

Shut-Off Valve

Cap

Sediment Trap

INSTALLATION INSTRUCTIONS

Determining the required pipe size.

The gas system is designed to operate at a certain

maximum pressure drop. A pressure drop greater

than what is permissible can cause operational

issues with the gas appliances. The National Fuel

Gas Code (NFPA 54, ANSI Z223.1 2012) allows for

three pressure drop levels, a 0.3 inch W.C., (see

table 2); a 0.5 inch W.C., (see table 3) and a 3.0 inch

W.C., (see table 4) pressure drop for natural gas.

Only a 0.5 inch W.C. pressure drop is allowable with

Propane (see table 5). For Canadian installations the

maximum allowable pressure drop is 0.5 inch W.C.,

(see table 3).

Measure the inlet gas pressure to the system using

a manometer. For Natural Gas, if the inlet pressure

is less than 8.0 inches W.C. then use Table 2 or 3

for your gas pipe sizing. Table 4 can only be used if

the inlet gas pressure is 8.0 inches W.C. or greater.

Table 4 cannot be used for Canadian installations.

The gas piping system consists of a main trunk

line that runs from the meter/regulator and branch

lines that run from the trunk line to the individual

appliances. A branch may carry gas for more than

one appliance.

The trunk line must be sized to carry the entire load

of all the gas appliances on the system. As with

determining the meter/regulator size, total the BTU

of all the appliances together and divide that by the

heating value of the fuel (for natural gas the average

is 1,024 or 2,546 for propane). This will give you the

total cubic feet per hour of gas required for the trunk

line. Measure the total length of the line Refer to

Table(s) 2, 3, or 4 and find the number closest to but

higher than the total cubic feet per hour requirement

calculation. This will tell you the minimum size that

the trunk line must be.

Each branch line must be sized to carry the load

of the appliance(s) attached to it. If more than one

appliance is on a branch total the BTU and as with

the trunk line divide that by the heating value of the

fuel. Refer to Table(s) 2, 3, or 4 and find the number

closest to but higher than the total cubic feet per

hour requirement calculation for the branch and

appliance(s). This will tell you the minimum size for

that branch line and appliance.

Final Considerations

If this water heater is replacing an existing water

heater, it is important to verify the capacity of the gas

system. Check the capacity of the meter/regulator,

and verify the pipe lengths and sizes.

An improperly sized gas system will cause

operational issues with this water heater. Other

appliances on the gas system may be affected as

well.

Flexible Gas Connectors may be used however the

BTU capacity of the connector must be checked.

Each connector has a capacity label on it, verify

that the connector has a BTU capacity greater than

that of the water heater. An undersized flexible gas

connector will cause operational issues with this

water heater.

Half-inch gas lines are permissible provided the

gas system meets certain requirements. First, the

gas pressure on the system must be 8.0 inch W.C.

or greater when installed using natural gas fuel.

Second the capacity of the pipe as outlined in Table

4 is followed. If the existing pipes are too small it

could cause a pressure drop greater than 3.0 inch

W.C. and will cause operational issues with this

water heater as well as other gas appliances on the

system.

Gas Supply

Rheem recommends connect-

ing the water heater as the ﬁrst

appliance downstream of the gas

meter, to ensure a sufﬁcient gas

supply

Gas meter's capacity > Total gas

capacity of connected appliances

Gas Supply Line

The water heater

is recommended

to be the ﬁrst

appliance to be

connected to the

gas supply line.

Table 2 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)

Inlet System Pressure: Less than 2 PSI (55 inches W.C.)

Allowable Pressure Drop: 0.3 inches W.C.

Speciﬁc Gravity : 0.60

(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 131 273 514 1,060 1,580

20 90 188 355 726 1,090

30 72 151 284 583 873

40 62 129 243 499 747

50 55 114 215 442 662

60 50 104 195 400 600

70 46 95 179 368 552

80 42 89 167 343 514

90 40 83 157 322 482

100 38 79 148 304 455

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table

6.2(a)

Table 4 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)

Inlet System Pressure: 8.0 inches W.C. or greater, but Less than 2

PSI (55 inches W.C.)

Allowable Pressure Drop: 3.0 inches W.C.

Speciﬁc Gravity : 0.60

(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 454 949 1,787 3,669 5,497

20 312 652 1,228 2,522 3,778

30 250 524 986 2,025 3,778

40 214 448 844 1,733 2,597

50 190 387 748 1,536 2,302

60 172 360 678 1,392 2,085

70 158 331 624 1,280 1,919

80 147 308 580 1,191 1,785

90 138 289 544 1,118 1,675

100 131 273 514 1,056 1,582

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table

6.2(c)

Table 3 - Pipe-Sizing - Natural Gas

Schedule 40 Metallic Pipe (Black Iron)

Inlet System Pressure: Less than 2 PSI (55 inches W.C.)

Allowable Pressure Drop: 0.5 inches W.C.

Speciﬁc Gravity : 0.60

(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 172 360 678 1390 2090

20 118 247 466 957 1430

30 95 199 374 768 1150

40 81 170 320 657 985

50 72 151 284 583 873

60 65 137 257 528 791

70 60 126 237 486 728

80 56 117 220 452 677

90 52 110 207 424 635

100 50 104 195 400 600

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table

6.2(b)

Table 5 - Pipe-Sizing - Undiluted Propane

Schedule 40 Metallic Pipe (Black Iron)

Inlet System Pressure: 11 inches W.C.

Allowable Pressure Drop: 0.5 inches W.C.

Speciﬁc Gravity : 1.5

(Capacity in cubic feet per hour)

Length Pipe Size (Inches)

½ ¾ 1 1¼ 1½

10 291 608 1150 2350 3520

20 200 418 787 1620 2420

30 160 336 632 1300 1940

40 137 287 541 1110 1660

50 122 255 480 985 1480

60 110 231 434 892 1340

80 101 212 400 821 1230

100 94 197 372 763 1140

125 89 185 349 716 1070

150 84 175 330 677 1010

Information in this chart obtained from NFPA 54, ANSI Z223.1 - 2012 Table

6.3(d)

Gas Supply

INSTALLATION INSTRUCTIONS

This is an example, in US, refer to current National

Fuel Gas Code, NFPA 54 for correct pipe sizing

chart, and in Canada, refer to current Natural Gas

and Propane Installation Code CAN/CSA B149.1.

Gas Supply

INSTALLATION INSTRUCTIONS

Gas Supply Installation

Install a ground joint union or ANSI design-certified

semi-rigid or flexible gas appliance connector to

the open end of the manual gas appliance shut-off

valve. The NFGC, ANSI Z223.1 and CAN/CSA B149.1

codes mandate the use of manual gas shut-off valve.

Install a manual gas supply line shut-off valve

to the end of the gas supply line.

Using the proper-size piping, fittings, and

components, build the gas supply line to the water

heater.

NOTICE:

The gas supply line should be a minimum of 3/4-in. (1.9-

cm) black steel pipe or other approved gas piping material.

Install a sediment trap at the lowest portion of the

gas line.

The inlet gas pressure to the water heater must NOT

exceed 10.5 in. w.c. (2.6 kPa) for natural gas and

13 in. w.c. (3.2 kPa) for LP gas. For purposes of

input adjustment, the minimum inlet gas pressure

(with main burner on) is shown on the water heater

rating plate. If high or low gas pressures are present,

contact your gas supplier for correction.

Gas Supply

INSTALLATION INSTRUCTIONS

Leak Testing

WARNING:

Never use an open flame to test for gas leaks, because

death, personal injury, and/or property damage can result.

The water heater and its gas connections MUST be leak-

tested at normal operating pressures before the unit is

placed in operation. These tests should also include all

factory connections.

• Turn on the gas shut-off valve(s) to the water heater.

• Use a soapy water solution to test for leaks at all

the connections and fittings. If bubbles are seen,it

indicates a gas leak that must be corrected.

• Contact a qualified service technician.

Pressure Testing the Gas Supply System

WARNING:

If inlet gas pressure is out of allowable range [4.0” w.c.

(1.0kPa) – 10.5” w.c. (2.6kPa)] for Natural Gas, or [8.0” w.c.

(2.0kPa) – 13.0” w.c. (3.2kPa)] for LP gas, a gas pressure

regulator must be installed to maintain the allowable inlet

gas pressure.

The water heater and its manual gas shut-off valve

must be disconnected from the gas supply piping

system during any pressure testing of the system at

test pressures in excess of 1/2 psi (3.5 kPa).

The water heater must be isolated from the gas

supply piping system by closing the manual gas

shut-off valve during any pressure testing of the gas

supply piping system at test pressures equal to or

less than 1/2 psi (3.5 kPa).

Gas Supply

Electrical

INSTALLATION INSTRUCTIONS

Gas Supply

Electrical Wiring

DANGER:

Shock Hazard – Before servicing the water heater, turn

off the electrical power to the water heater at the main

disconnect or circuit breaker. Failure to do so will result in

death or serious personal injury.

WARNING:

Field wiring connections and electrical grounding must

comply with local codes or, in the absence of local codes,

with the latest edition of the National Electrical Code, ANSI/

NFPA 70, or in Canada, Canadian Electrical Code, CAN/CSA

C22.1, Part 1.

CAUTION:

Label all wires prior to disconnecting

is recommended

Wiring errors can cause personal injury, product damage,

and/or dangerous operating conditions. Verify correct

operation after servicing.

NOTICE:

• DO NOT connect power until venting installation is

complete (see Venting Installation).

• Wait ninety (90) seconds after power is connected for the

first time to initiate operation of the water heater.

Power consumption is up to 100 Watts during normal

operation, 3-5 Watts during standby, waiting to run, and up

to 200 Watts during the freeze protection operation.

Power Cord

The electric power supply requirement for this water

heater is 120 VAC/60 Hz, 2 amps.

A dedicated circuit is recommended for the water

heater. It is recommended not to connect to a GFCI

or AFCI circuit. Multiple units may be connected to a

single circuit up to the circuit rating.

DO NOT use 3-prong to 2-prong adapters. DO NOT

use power strips or multiple outlet adapters.

All water heaters come with a 3-prong power cord.

Only use this power cord and a matching grounded

electrical outlet.

Keep any excess length of the power supply cord on

the outside of the water heater.

If local codes require hard-wiring, see instructions for

“Hard-Wiring the Electrical Connections” below.

For outdoor installations, hard-wiring is required. See

instructions in Outdoor Conversion kit for details

Hard-Wiring the Electrical

Connections

Wiring should be performed by a qualified electrician

in accordance with local codes.

The water heater requires a properly grounded

120 VAC/60 Hz dedicated power supply. Multiple

water heaters may be connected to a single circuit

up to that circuit’s rating.

DO NOT connect grounding wire to water pipes, gas

pipes, telephone cables, lighting conductor circuits,

or to any other grounding circuits that require a GFCI

or AFCI (arc fault circuit interrupter).

An ON/OFF switch must be provided and installed

for the incoming 120 VAC power supply.

Wire the water heater exactly as shown in the wiring

diagram. This wiring diagram can also be found

inside the water heater cover panel.

The green screw is provided in the enclosure for a

grounding connection.

Connect the live wire to the black wire and neutral

wire to the white neutral wire.

High-Altitude Installation

The water heater is certified for installations up to

10,200 ft. (3,110 m) above sea level. The input rating

of this water heater is based on sea level operation.

At higher elevations, the actual input rate may be

lower than the value listed on the rating label due to

the derating of Natural Gas and LP Gas.

NOTICE:

For installations above 2000 ft. (610 m) elevation,

contact a qualified service technician to make the proper

altitude adjustments. See “High Altitude Adjustments” for

additional information.

WARNING:

DO NOT install this water heater at elevations above

2000 ft. (610 m) without the proper adjustments. Please

contact your installer, local gas supplier, place of purchase,

or the Rheem Customer Service phone number listed in the

“Call for Assistance” section.

Gas Supply

Wiring Diagram

Electrical

INSTALLATION INSTRUCTIONS

Insulation Blankets

In general, insulation blankets for external use on gas

water heaters are not necessary. The purpose of an

insulation blanket is to reduce the standby heat loss

from the water heater’s storage tank. Since these

water heaters DO NOT store water, they eliminate

the need for the insulation blanket.

WARNING:

Never cover the air inlet, vent exhaust, or operating and

warning labels attached to the water heater. Covering these

components will cause dangerous operating conditions that

can lead to death, personal injury, property damage, and/or

product damage.

The manufacturer’s warranty does not cover any

damage or defect caused by insulation, insulation

attachment, or use of any type of energy-saving

or other unapproved devices (unless authorized

by the manufacturer). The use of unauthorized

energy-saving devices can result in death, personal

injury, and/or property damage. The manufacturer

disclaims any responsibility for such loss or injury

resulting from the use of such unauthorized devices.

Installation Precautions

• Follow all installation instructions covered in this

manual.

• Check the inlet gas pressure to make sure it is

within the range specified on the rating plate.

• Make sure there is adequate air for combustion

and ventilation as described on "Venting" in this

manual.

• Maintain proper clearances to combustibles

and noncombustibles as specified on the rating

plate.

• Make sure the venting system complies with

local codes, National Fuel Gas Code (ANSI

Z223.1/NFPA 54) or Natural Gas and Propane

Installation Code (CAN/CSA B149.1), and the

guidelines found on "Venting" in this manual.

Contact the local gas company to make sure the gas

meter and gas piping are adequately sized.

Use only Teflon tape on all male water line

connections and fittings.

DO NOT block or restrict any outside air intake

openings.

DO NOT remove the front cover unless absolutely

necessary. This should only be done by a qualified

service technician.

DO NOT install this product where standing water

may occur.

DO NOT use pipe dope on water line connections

and fittings.

DO NOT use Teflon tape on gas line connections

and fittings in US.

INSTALLATION INSTRUCTIONS

Piping for Space Heaters

Local codes or plumbing authority requirements may vary

from the instructions or diagrams provided in this manual

and take precedence over these instructions.

Combination Potable and Space

Heating Application

DANGERS:

When this system requires water for space heating at

elevated temperatures (above 125°F [52°C]), a mixing or

tempering valve MUST BE installed in the hot water supply

line to the house in order to reduce the scald hazard

potential.

Any piping or components used in the installation

of this water heater in a combination potable and

space heating application must be suitable for use

with drinking water.

If this water heater is installed in an application

intended to supply domestic hot water needs

and hot water for space heating purposes, DO

NOT connect the heater to an existing heating

unit or components of a heating system that have

previously been used with a nondrinking water

system.

Toxic chemicals such as those used for boiler

treatment may be present and will contaminate the

drinking water supply causing possible health risks.

Never introduce toxic chemicals, such as glycol and

those used for boiler treatment, into this system.

This water heater is NOT approved as the dedicated

space heating unit.

This water heater must be used for combination

applications with air handler only and not for indoor

heating applications, such as in-floor or radiant

heating.

Typical Combination Installation

Gas

Supply

Line

Drain Valve

Tempering

Valve

Tempered

Water

Shut-Off

Valve

Air

Separator

Air Handler

Potable Water

Expansion Tank

(2 gallons)

Cold Water Supply

Shut-Off Valve

Cold Water

Supply

Check

Valve

(Pump included)

INSTALLATION INSTRUCTIONS

Recirculation Control (With External Pump)

This section “Recirculation Control (With External

Pump)” is applicable for models without built-in

pump.

Local codes or plumbing authority requirements

may vary from the instructions or diagrams provided

in this manual and take precedence over these

instructions.

Your tankless water heater has the ability to control

an external recirculation pump. Two modes are

available, Energy Saver and Performance, which

recirculate the water in plumbing system to

provide hot water more quickly when a faucet is

opened. Instructions for recirculation programming

can be found on page 86. Rheem offers a fully

packaged recirculation pump kit. See the Parts and

Accessories catalog for more information

NOTICE:

Recirculation control is for residential application only.

Recirculation control cannot be used with an air handler

or with multiple water heater installations. The maximum

temperature setting is 140°F (60°C) in recirculation control.

Pump Requirements

Voltage: 120V, 60Hz

In-rush current: Less than 2.5 amps

Amperage: less than 2.0 amps

WARNING:

A control board can be damaged if amperage exceeds 2.0

amps.

Pump Size

The pump should be sized for about 2.5 gpm at the

pressure drop through the tankless water heater and

the supply and return plumbing in the recirculation

loop. Contact service department listed on page

107 of this use and care manual if you need more

information.

Hot Water

to Fixtures

Hot Water

Loop

Dedicated

Return Line

Circulation

Pump with built

in check valve

Expansion

Tank

Wire to Connect

Pump to heater

(8 ft long)

Cold water

to Tankless

Cold Water

Supply

(Copper Pipe)

Check

Valve

Shut off

Valve

(Copper Pipe)

Optional Shut

off valve

Typical Recirculating Pump Installation

Recirculating Pump

INSTALLATION INSTRUCTIONS

Installation

Disconnect all electric power to the water heater.

Remove the front cover panel on the water heater.

Install the recirculation pump on the return line

according to the pump manufacturer installation

instructions. Install a check valve in the return line

as shown in typical recirculation pump installation

if one is not integrated into the pump. See "Typical

Recirculation Pump Installation".

NOTICE: Some pumps may have built in check valve

The wire harness for the recirculation pump is

bundled with the wire harness from the control

board. Find a blue connector with a black and a

white wire.

To connect to the pump, cut the blue connector,

splice the wires, and add a 4 amp fuse to the hot

wire of the pump. Rheem recirculation pump kit

includes a molex connector and a 4 amp fuse so

splicing wires is not required.

Connect the ground wire from the pump to a screw

at the base of the water heater cabinet.

NOTICE:

Follow any applicable electrical code and the pump

manufacture installation instruction referring to the

Pump Electrical Connection Diagram in Step 5 of these

instructions.

Plug in the power cord or reconnect the power

supply at the circuit breaker box.

Recirculation Control (With External Pump)

Control

Board

Blue

connector

Control

Board

PUMP

Add

4 Amp

Fuse

Blue

connector

Cut blue connector

and splice wires.

Recirculating Pump

Ground

INSTALLATION INSTRUCTIONS

Recirculating Pump

Recirculation Control With

Thermal Bypass (Crossover) Valve

Recirculation Control

(Recommended size and length for recirc line)

Thermal bypass (crossover) valves can be used for

applications that DO NOT have a dedicated return

line. The thermal bypass (crossover) valve should

be installed at the farthest fixture. It is strongly

recommended to use a Rheem approved valve

for optimal performance and reliability. Rheem

recommends the following part numbers for this

purpose:

• Grundfos Kit - RTG20285

• Grundfos Valve - 595926

• Aquamotion - AMK-ODR

• Navien Navicirc - PFFW-SXX-001

Refer to the table on this page for the maximum

allowable equivalent pipe length. See the crossover

valve instructions for additional details.

CAUTION:

Warm water may be present in cold water fixtures and

cold water line during pump operation and a short period

thereafter, when using cold water line as a return line.

To conserve energy and minimize heat loss, insulation of hot water lines is recommended.

Power receptacle

should be close to

appliance

Tankless

water heater

power cord

Cold

To fixture

Hot

Service

valves

Fixtures

Hot Cold Hot Cold

Cold

water line

Expansion

tank

Install Thermal Bypass

(Crossover) Valve

at the farthest fixture

Cold water

to tankless

water heater

Cold water

supply

(Copper pipe)

Check

valve

Shut-off

valve

Shut-off

valve

(Copper pipe)

Typical Installation With Comfort Valve Kit

Maximum Alowable Equivalent Pipe Length*

Pipe Diameter (Copper pipe) 3/4" 1/2"

Maximum allowable equivalent pipe length 400 ft. 100 ft.

*Equivalent pipe length includes hot water line, return lines and all fitting

INSTALLATION INSTRUCTIONS

Service alert reminds users of water heater

maintenance activities such as flushing the heat

exchanger or replacing the water treatment filter

(if applicable) in order to maximize the life of

your tankless water heater. In addition to those

maintenance activities, conduct inspections, care

cleaning and preventive maintenance activities refer

to “Water Heater Inspections”, “Care and Cleaning”

and “Preventive Maintenance” in this Use and Care

Manual. Contact technical service department listed

on page 107 of this use and care manual if you are

not familiar with these maintenance activities.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the "SERVICE" button.

Press the "▼" or "▲" button until "Service Alert" is

displayed, and press the "ENTER" button.

The Factory setting is "OFF". Press the "▼" or "▲"

button to choose between "500 Hours", "750 Hours"

or "1000 Hours" of combustion time for the service

alert and press "ENTER" button to confirm.

To exit this setting, press "Back" button until the

initial screen is displayed.

NOTICE:

It is recommended not to change default 500 hours unless

it is absolutely necessary.

Turn on the gas and water to the water heater by

opening the shut off valves.

Service Alert

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

MANIFOLD ROTATE?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Service Alert

SETTINGS

BACK ENTER

STATUS SERVICE MODE

500 HOURS

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

MANIFOLD ROTATE?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Service Alert

SETTINGS

BACK ENTER

STATUS SERVICE MODE

500 HOURS

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

Start/Adjust

INSTALLATION INSTRUCTIONS

Press the "SETTINGS" button.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the "▼" or "▲" button until “ Tankless Config”

is displayed, and press the “ ENTER “ button.

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless Config

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless Config

SETTINGS

BACK ENTER

STATUS SERVICE MODE

ALTITUDE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Sea Level

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless Config

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Elevation

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SEA LEVEL

The Factory setting is "Sea Level".

Press the "▼" or "▲" button to choose “Low

Altitude”, “Med. Altitude” or “High Altitude”, and

press the "ENTER" button to confirm.

To exit this setting, press "Back" button until the

initial screen is displayed.

Turn on the gas and water to the water heater by

opening the shut off valves.

WARNING:

When the water heater is installed above 2000ft (610m),

the setting on the LCD on the user interface need to be

changed altitude. If these setting are not changed, the

water heater may not function properly

High-Altitude Adjustments

SECTION HIGH-ALTITUDE

Sea Level 0 – 2,000 ft (0 m – 610 m)

Low Altitude 2,001 ft – 5,400 ft

(610 m – 1,650 m)

Med. Altitude 5401 ft – 7,900 ft

(1,650 m – 2,410 m)

High Altitude 7,901 ft – 10,200 ft

(2,410 m – 3,110 m)

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Temp Display

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Fahrenheit

SET POINT

Press the "▼" or "▲” button until “ Elevation ” is

displayed, and press the “ ENTER “ button.

Start/Adjust

INSTALLATION INSTRUCTIONS

Condensate drain is properly installed.

F. Condensate

Water temperature is set to a safe temperature

as described on "Setting the Water

Temperature".

G. Set Temperature

Installation Checklist

Indoor water heaters must be installed indoors.

Outdoor water heaters must be installed

outdoor.

Close to area of ventilation termination (indoor

models).

Protected from freezing temperatures.

Proper clearance from combustible material

observed.

Sufficient fresh air supply for proper operation

of water heater.

Air supply free of corrosive elements and

flammable vapors.

Provisions made to protect area from water

damage.

Sufficient room to service heater.

Combustible materials, such as clothing,

cleaning materials, and rags clear of the heater

and vent piping.

Water heater is properly secured to the wall.

A. Water Heater Location

B. Vent (Indoor Models)

Vent pipe material is ULC S636 approved and

manufacturer-approved.

Horizontal air intake pipe and exhaust pipe have

a 1/4" per foot UPWARD slope toward the vent

terminal.

Vertical venting is installed as described on

"Vertical Vent Installation.

Connection(s) securely fastened together with

cement and airtight.

All vent runs are properly installed.

Vent terminal is properly installed.

Maximum vent length is observed.

High altitude adjustment is properly made per

elevation.

Water supply has sufficient pressure.

Air has been purged from the water heater and

the piping.

Water connections tight and free from leaks.

C. Water Supply/Relief Valve

Gas type matches listing on rating plate.

Gas supply pressure is sufficient for the water

heater.

Gas line equipped with shut-off valve, union

and sediment trap as described on "Gas Supply

System."

Approved pipe-joint compound has been used

on all gas pipe connections.

All connections and fittings have been checked

for leaks with a soapy water solution.

Gas company inspected installation (if required).

Main gas valve to the water heater is turned on

D. Gas Supply

Supply cord and/or wiring meets all local

codes, National Electrical Code, ANSI/NFPA 70,

in the U.S., or Canadian Electrical Code, CAN/

CSA C22.1, Part 1, in Canada.

Voltage matches listing on rating plate.

Water heater is properly grounded.

E. Electrical Wiring

Water filter is clean and in place.

All piping has been assembled as described on

"Water Supply".

Water pipes are insulated and protected from

freezing, if necessary.

Pressure-relief valve properly installed with

discharge line running to open drain.

Discharge line protected from freezing, if

necessary.

Checklist

INSTALLATION INSTRUCTIONS

USING YOUR WATER HEATER

Activating the Water Heater

WARNING:

Before operating this water heater, be sure to read and

follow the instructions on the following label, all labels on

the water heater, and the “Important Safety Information”

section in this manual. Failure to do so can result in unsafe

operating conditions that can result in death, personal

injury, property damage, and/or product damage.

WARNING : If you do not follow these instructions exactly, a fire or explosion may result

causing property damage, personal injury or loss of life.

FOR YOUR SAFETY READ BEFORE OPERATING

1.STOP! Read the safety information above on this label.

2.Turn off all electric power to the appliance.

3.DO NOT attempt to light the burner by hand.

4.Turn the Gas Shutoff Valve located on the outside of the unit

clockwise to the "OFF" position.

5.Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow "B" in

the safety information above on this label. If you don't smell gas, go to the next step.

6.Turn the Gas Shutoff Valve located on the outside of the unit counterclockwise to

the "ON" position.

7.Turn on all electric power to the appliance.

8.If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance"

and call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

Turn off all electric power to the appliance if service is to be performed.

Turn

the

Gas

Shutoff

Valve

located

the

outside

the

unit

clockwise to

the

"OFF"

position.

GAS SHUTOFF

VALVE

OPEN CLOSE

OPERATING INSTRUCTIONS

Start/Adjust

Operating Instructions

Read, understand, and follow the safety information

listed on the operating label and in the “Important

Safety Information” section in this manual.

Turn water heater off. Unplug the water heater from

electrical outlet or disconnect the power supply at

the circuit breaker.

Turn the gas shut-off valve clockwise to the OFF

position. This valve is located on the outside of the

water heater. Wait 5 minutes to clear any gas. If you

don’t smell gas, proceed to Step 3.

NOTICE:

If you smell gas, STOP and follow the safety instructions

listed under B on the operating label or on previous page of

this manual.

Turn the gas shut-off valve counterclockwise to the

ON position.

Turn on all electric power to the water heater. The

water heater burner will automatically light when

there is a demand for hot water.

Activating the Water Heater

USING YOUR WATER HEATER

WARNING:

DO NOT attempt to light the burner by hand. Lighting the

burner by hand is an unsafe operating condition that can

result in death, personal injury, property damage, and/or

product damage.

If the water heater burner will not light, turn off the

water heater as described below and call your

service technician or gas supplier.

Shutting Off the Water Heater

Turn water heater off. Unplug the water heater from

electrical outlet or disconnect the power supply at

the circuit breaker.

Turn the gas shut-off valve clockwise to the OFF

position.

Activating the Water Heater

USING YOUR WATER HEATER

Start/Adjust

Use Instructions

WARNING:

• Flammable vapors can be drawn by air currents

from surrounding areas to the water heater. Vapors

can ignite causing death, personal injury, or product

damage.

• DO NOT store or use flammable or combustible

materials (gasoline, paint thinner, adhesives,

solvents, newspapers, rags, mops, etc.) in the

vicinity of the water heater or any other gas

appliance. If they must be used, open doors and

windows for ventilation, and shut off all gas-

burning appliances, including their pilot lights.

• DO turn off manual gas shut-off valve if water

heater has been subjected to overheating, fire, flood,

physical damage, or if the gas supply fails to shut

off.

• DO NOT turn on water heater unless water and gas

supplies are completely opened.

• DO NOT turn on water heater if cold water supply

shut-off valve is closed.

• If there is any difficulty in understanding or

following the operating and care instructions in

this manual, it is recommended that you contact a

qualified service technician to perform the work.

Safety Precautions

Setting the Water Temperature

D ANGER

HOT

Water temperature over 125°F (52°C)

can cause severe burns instantly or

death from scalds.

Children, disabled and elderly are

at highest risk of being scalded.

See instruction manual before

setting temperature at water

heater.

Feel water before bathing or

showering.

Temperature limiting valves are

available, see manual.

BURN

Time/Temperature Relationship in Scalds

Water Temperature Time to Produce a Serious Burn

120°F (49°C) More than 5 minutes

125°F (52°C) 1 1/2 to 2 minutes

130°F (54°C) About 30 seconds

135°F (57°C) About 10 seconds

140°F (60°C) Less than 5 seconds

145°F (63°C) Less than 3 seconds

150°F (66°C) About 1 1/2 seconds

155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

DANGER:

Water temperatures above 125°F (52°C) will result in death and/or

severe burns from scalding.

Safety and energy conservation are factors to be considered when

selecting the water temperature setting. The temperature of the water

in the water heater can be regulated by setting the temperature on

the heater control. Be sure to read and follow the warnings outlined

on the pictured label.

The recommended setting for the water temperature is 120°F (49°C).

The heater control has been preset and shipped at 120°F (49°C)

temperature setting.

Safety factors should be considered whenever altering the water

temperature setting. The chart below may be used as a guide in

determining the proper water temperature for your home.

USING YOUR WATER HEATER

Use Instructions

USING YOUR WATER HEATER

Maximum water temperature occurs while the

water heater burner is ON. To determine the water

temperature:

Turn on the hot water faucet and place a

thermometer in the water stream.

NOTICE:

Water temperature at the faucet may vary depending on the

season and the length of pipe from the water heater.

The heater control temperature range is between

85°F (29°C) and 140°F (60°C). See "Setting The Water

Temperature" in this Use and Care Manual to adjust

the temperature to the desired setting. The new

temperature set point will show on the LCD (Liquid

Crystal Display).

NOTICE:

Cannot change the temperature set point on the user interface

when a hot water faucet is in the open position. Close a hot

water faucet when the temperature set point is changed.

The water heater may not operate with a small

water flow. Increase the water flow and recheck. If

it still does not operate with the hot water faucet

completely open, increase the temperature setting

on the User Interface.

Default temperature shown in Fahrenheit.

See "Setting the Water Temperature" in this U&C

manual.

Water Heater Facts

DANGER:

Water temperatures above 125°F (52°C) will result in death

and/or severe burns from scalding.

• The hottest temperature water will be at the faucet

closest to the water heater.

• Always remember to test the water temperature

with your hand before use.

• Always supervise young children or others who are

incapacitated.

• The water heater is equipped with a device that will

shut off the gas supply to the burner if the water

heater exceeds normal operating temperatures.

• Any water heater that has been subjected to fire,

flood, physical damage, or been under water should

be turned off at the manual gas shut-off valve and

not used until it has been checked by qualified

service personnel.

Setting the Water Temperature

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

UNLOCK / LOCK (HOLD 3 SEC)

Warning

Blower On

Recirculation On

Screen Lock

Burner On

Status

Icons

Set Point

Temperature

Control

Button

Indicator

Icons

Control

Buttons

Cloud Connectivity

Wi Fi

Diagnostic

Setting the Water Temperature

WARNING:

Improper adjustment, alteration, service, or maintenance

can result in death, personal injury, property damage, and/

or product damage.

Setting delivered water temperature

DANGER:

Water temperatures above 125°F (52°C) will result in death

and/or severe burns from scalding.

WARNING:

Refer to chart below and the scald potential warnings

on page 4 on this manual before making an adjustment.

Changing this setting is done at your own risk.

Residential water heater temperatures can be

adjusted up to 140°F (60°C). DO NOT perform the

following adjustment if a setting of up to 140°F (60°C)

is not required.

*Water heater maximum flow rate may vary with both

water heater temperature settings and incoming

water temperatures

DANGER:

Hotter water increases the potential for Hot Water SCALDS.

Display needs to be unlocked before the settings

can be changed. Push and hold two buttons in

center until beeping sound is heard. Once unlocked

the “SETTINGS”, “STATUS” or “SERVICE” menus

can be accessed.

Unlocked display shown above

Temperature “SET POINT” can be changed by

accessing the “SETTINGS” menu.

Time/Temperature Relationship in Scalds

Water Time to Produce

Temperature a Serious Burn

120°F (49°C) More than 5 minutes

125°F (52°C) 1 1/2 to 2 minutes

130°F (54°C) About 30 seconds

135°F (57°C) About 10 seconds

140°F (60°C) Less than 5 seconds

145°F (63°C) Less than 3 seconds

150°F (66°C) About 1 1/2 seconds

155°F (68°C) About 1 second

Table courtesy of Shriners Burn Institute

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

Center buttons

Press and hold both buttons

Lock icon is dimmed,

when display is unlocked

Press button

to access

“SETTINGS”

Menus

Lock icon

Temperature Conversion Chart °F/°C (Reference only)

85 100 102 104 106 108 110 112 114 116 118 120 125 130 140 °F

29 38 39 40 41 42 43 44 46 47 48 49 52 54 60 °C

Use Instructions

USING YOUR WATER HEATER

After you select “SETTINGS” scroll through the

menu to select “SET POINT”, to enter the set point

mode press “ENTER” button, which is the right most

button.

Now press the “▼” or “▲” button in the center of

the display to increase or decrease the temperature.

Temperature can be changed in increments of 1°F.

Once temperature is set to the desired value, press

“ENTER” button, right most button to store value.

To exit this setting, press "Back" button until the

initial screen is displayed.

How To Change The Temperature

Display

Press the "SETTINGS" button.

Press the “▼” or “▲” button until "Temp Display is

displayed, and press "ENTER" button.

The Factory setting is "Fahrenheit". Press the “▼” or

“▲” button to select "Fahrenheit" and "Celsius", and

press the "ENTER" to confirm.

To exit this setting, press "Back" button until the

initial screen is displayed.

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Temp Display

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Fahrenheit

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Temp Display

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Fahrenheit

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Temp Display

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Fahrenheit

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

Setting the Water Temperature

Center buttons

USING YOUR WATER HEATER

Use Instructions

This section is applicable for pump built-in models,

and standard models with an external pump

following the pump installation described on pages

73-74 of this manual. If the external pump is installed

independently from the water heater, this section is

not applicable.

For recirculation setting, timer mode, schedule mode,

and on demand mode are available. Timer mode also

has Performance mode and Energy Saver mode.

Read next several pages to set most suitable mode.

Contact service department listed on page 107 of

this use and care manual if additional help is needed.

Mode Setting - Timer mode-

Press the “ SETTINGS” button.

Press the “▼” or “▲” button until “Tankless Config”

is displayed, and press the “ENTER” button.

Press the “▼” or “▲” button until “Recirc. Pump

Modes” is displayed, and press the “ENTER“ button.

The Factory setting is “None”.

Press the “▼” or “▲” button to select “Timer-

Perf” or “Timer-E-Saver” and press the “ENTER” to

confirm.

Recirculation Operation

-Timer mode -

The water heater is turned ON when the recirculation

pump starts operation. The water heater produces

hot water at the setting temperature. When the

return water temperature reaches approximately

15°F below the setting temperature, the water heater

and the pump will turn OFF. The cycle will restart

at the approximate time based on the temperature

thermistor readings.

Performance mode (Timer-Perf)

The performance mode operates as below;

• Higher energy consumption due to more pump

cycles

• Pump cycles ON Every 15 to 30 minutes

Energy Saver mode (Timer E-Saver)

The Energy Saver mode operates as below;

• Less Energy consumption due to fewer pump

cycles

• Pump cycles ON Every 30 to 60 minutes

Recirculation Setting

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

Recirculating Pump

USING YOUR WATER HEATER

Recirculation Setting

Recirculating Pump

Mode Setting - On Demand-

Press the “ SETTINGS ” button.

Press the “▼” or “▲” button until “Tankless Config” is

displayed, and press the “ ENTER“ button.

If incorrect setting is entered at any steps, press the

"Back" button until the initial screen.

Redo from step 1.

Press the “▼” or “▲” button until “Recirc. Pump

Modes” is displayed, and press the "ENTER" button.

The Factory setting is “None”.

Press the “▼” or “▲” button until “On-Demand” is

displayed, and press the "ENTER" button.

To exit this setting, press "Back" button until the initial

screen is displayed.

Recirculation Operation-On Demand -

When set to "On-Demand" mode, the recirculation

pump is on for a set draw duration when a signal

is received from a connected device or accessory,

or until the return water temperature reaches

approximately 15°F below the setting temperature.

It is recommended to utilize the EcoNet application for

On-Demand installations, where possible. Alternatively,

the following accessories are supported for these

heaters, depending on the recirculation pump used:

1. Internal Recirculation Pump (SR Models):

2. Rheem Demand Pump (AP18403/AP18537):

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

Rheem Part Number Description

SP20862 Motion Sensor Kit

SP20863 Wired Push Button

SP20861 Wired Remote Transmitter

Rheem Part Number Description

SP20863 Wired Push Button

USING YOUR WATER HEATER

Recirculation Setting

Recirculating Pump

Mode Setting

-Manually operate pump-

On-Demand mode allows to turn ON the recirculation

pump manually.

(Disabled in Timer mode)

Press the “ SETTINGS ” button.

Press the “▼” or “▲” button until “Tankless Config”

is displayed, and press the "ENTER" button.

If incorrect setting is entered at any steps, press the

"Back" button until the initial screen.

Redo from step 1.

Press the “▼” or “▲” button until “Recirc. Pump” is

displayed, and, press the “ENTER” button.

The Factory setting is “Disabled”.

Press the “▼” or “▲” button until "Enable" is

displayed and press the "Enter" button.

To exit the setting, press "Back" button until the initial

screen is displayed.

Recirculation Operation

-Manually operate pump-

When set the “Recirc. Pump” ON, the recirculation

pump is ON for a set draw duration or until the return

water temperature reaches approximately 15°F

below the setting temperature.

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Disable

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

USING YOUR WATER HEATER

Mode Setting -Schedule-

Press the “ SETTINGS ” button.

Press the “▼” or “▲” button until “Tankless Config”

is displayed, and press the "ENTER" button.

Press the “▼” or “▲” button until “Recirc. Pump

Modes” is displayed, and press the "ENTER" button.

The Factory setting is "None"

Press the “▼” or “▲” button until “Schedule” is

displayed, and press the "ENTER" button.

To exit this setting, press "Back" button until the

initial screen is displayed.

NOTICE:

To use this schedule mode, it is required to set Wi-Fi on this

user interface and to download the specific application on

your smart phone. Please see "Wi-Fi Setting" in this U&C

manual to set Wi-Fi on this user interface and to download

the application.

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

Recirculation Setting

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

USING YOUR WATER HEATER

Recirculating Pump

WiFi Setup (At initial power up)

Display will ask at initial power up if the user wants

to Setup WiFi. The user can press ENTER to

continue Wi-Fi setup or BACK to exit setup and turn

OFF WiFi signal broadcast. When running multiple

units together in manifold, only the unit designated

as Instance 1 should be connected to WiFi. See the

Multiple Unit Controls section.

If need WiFi setup, press “ENTER” button.

WiFi signal is broadcasted for 30 minutes and the

user will use the EcoNET Application to continue the

setup process. The steps are in the application.

If user chooses to set up WiFi later, press “BACK”

button. WiFi signal will not be broadcasted until user

goes to additional steps.

WiFi Setup (After initial power up)

Press the “STATUS” button.

Press the “▼” or “▲” button until “WiFi status” is

displayed, and press “ENTER” button.

Press the “▼” or “▲” button until “WiFi Setup?” is

displayed, and press “ENTER” button.

Press the “▼” or “▲” button until “Yes” is displayed,

and press “ENTER” button.

WiFi signal will start to broadcast (WiFi icon will start

to blink) for 30 minutes and user can use the EcoNet

Application to setup WiFi.

If setup is not completed in the next 30 minutes, WiFi

will stop broadcasting. User should go to these steps

again to re-start WiFi setup.

Once WiFi is setup correctly, WiFi icon will become

solid.

In the event that WiFi credentials are changed,

please follow WiFi setup steps again.

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

WiFi Setting (Select models only)

WiFi

USING YOUR WATER HEATER

Start/Adjust

WiFi Setting

Steps to reset WiFi

These steps are to reset the WiFi chip, in the event

that WiFi stops working and WiFi credentials are

NOT changed.

To reset WiFi and make it try to connect to the

network again,

Press the “Service” button.

Press the “▼” or “▲” button until “WiFi Reset” is

displayed, and press “ENTER” button.

Press the “▼” or “▲” button until “Yes” is displayed,

and press “ENTER” button.

WiFi signal will reset and WiFi icon all start blinking

again.

WiFi will try to reconnect to the stored WiFi network

using the same credentials.

Once WiFi is connected again correctly, WiFi icon will

become solid.

Models with WiFi can be monitored and controlled

from the EcoNet mobile app. Scan the QR code for

download.

Follow in-app instructions for setup

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINTWiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Setup?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Status

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

WiFi Reset

WiFi

USING YOUR WATER HEATER

Start/Adjust

Water Saving Control

Water saving control is optional and is inactive

as default. To activate this control, appropriate

procedures must be followed.

Water saving control can reduce waste water at

initiation of hot water demand by reducing flow

until outlet hot water reaches set temperature. It is

recommended to turn ON this control if the water

heater is installed in a drought area or anywhere

water conservation is needed.

Follow the steps below to turn ON the water saving

control:

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the "SETTINGS" button.

Press the "▼" or "▲" button until "Tankless Config"

is displayed, and press the "ENTER" button.

Press the "▼" or "▲" button until "Water Saver

Mode" is displayed, and press the "ENTER" button.

The Factory setting is "Off".

Press the "▼" or "▲" button to select "On" and

press the "ENTER" button to confirm.

To exit this setting, press "Back" button until the

initial screen is displayed.

Turn on the gas and water to the water heater by

opening the shut off valves.

Start/Adjust

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

TANKLESS CONFIG

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Off

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Water Saver Mode

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

TANKLESS CONFIG

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Off

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Water Saver Mode

USING YOUR WATER HEATER

Follow the steps below to turn Off the water saver

model:

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the "SETTINGS" button.

Press the "▼" or "▲" button until "Tankless Config"

is displayed, and press the "ENTER" button.

Press the "▼" or "▲" button until "Water Saver

Mode" is displayed, and press the "ENTER" button.

Press the "▼" or "▲" button to select "Off" and

press the "ENTER" button to confirm.

To exit this setting, press "Back" button until the

initial screen is displayed.

Turn on the gas and water to the water heater by

opening the shut off valves.

Water Saving Control

Start/Adjust

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

TANKLESS CONFIG

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Off

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Water Saver Mode

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

TANKLESS CONFIG

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Off

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Water Saver Mode

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

Tankless ConfigSET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SETTINGS

BACK ENTER

STATUS SERVICE MODE

None

SETTINGS

BACK ENTER

STATUS SERVICE MODE

OFF

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Recirc.Pump Modes

SET POINT

USING YOUR WATER HEATER

Venting System

The venting system should be inspected annually

to ensure all of the vent sections are secure and

airtight. Qualified service personnel are familiar with

vent system inspections and may be contacted for

advice.

In applicable climates, periodically inspect the vent

and air-inlet terminals to ensure they are not blocked

by snow.

WARNING:

DO NOT operate the water heater if the vent system shows

signs of leaking exhaust. Leaking exhaust could lead to death,

personal injury, and/or product failure.

Check the air intake and vent exhaust for blockage

and/or debris.

DANGER:

Shock Hazard – Make sure the electrical power to the water

heater is OFF before removing protective cover. Electric shock

will cause death or serious personal injury.

Condensate Collector

CAUTIONS:

• Condensate is known to be acidic; refer to federal, state

(provincial), and local codes for proper handling and

discharge methods.

• DO NOT operate without the condensate collector

drain connected and routed to a proper drain

that can handle corrosive condensate. This could

cause the system to malfunction or fail. An external

condensate neutralizer needs to be installed to

local codes.

On a regular basis, inspect the condensate drain line

to ensure the condensate is draining properly.

WARNING:

The condensate coming from the water heater is known to be

acidic. Without an external neutralizer or a proper amount of

medium in the neutralizer, metals contacting the condensate

can be corroded. Periodically check the medium of the

external neutralizer visually to ensure that it is not depleted if

the external neutralizer is installed.

CARING FOR YOUR WATER HEATER

Water Heater Inspections

Care Instructions

Condensate Drain

(Only on re-

circulation

models)

Condensate Drain

Air Intake

Vent

Exhaust

Water

Filters

CARING FOR YOUR WATER HEATER

Burner

It is recommended the burner be annually inspected

by a qualified service technician.

DANGER:

Shock Hazard – Removing the front cover panel

exposes you to live electricity. Electric shock will

cause death or serious personal injury.

Remove the plastic covers.

Remove 4 screws and the unit cover panel.

Open a hot water faucet.

While the water heater is operating, inspect the main

burner flames through the burner sight glass, shown

above. The flames should be blue.

NOTICE:

If you observe unusual burner operation, shut off

the water heater and contact a qualified service

technician.

Turn off the hot water faucet and reinstall the unit

cover panel.

Water Heater Inspections

Care Instructions

Burner Sight

Glass

Care and Cleaning

DANGER:

Shock Hazard – Make certain power to the water

heater is OFF before removing protective cover

for any reason. Electric shock will cause death or

serious personal injury.

WARNING:

Combustible materials, such as clothing, cleaning

materials, or flammable liquids, must not be

placed against or next to the water heater. Fire or

explosion can occur causing death, personal injury,

and/or product damage.

All care and cleaning to and around the water

heater should only be performed with the water

heater turned off and the electrical power supply

disconnected.

Vacuum around the water heater to remove any dust,

dirt, and/or lint buildup.

Clean the water heater and the remote control with a

damp soft cloth and mild detergent. Gently wipe and

completely dry all surfaces.

Check the air intake and vent exhaust for blockage

and/or debris.

NOTICE:

The air intake requires a minimum of 12 in. (30 cm)

of clearance between the air intake opening and

any obstruction.

Clean the water filter monthly, as described below

and on the next page.

Water Filter Cleaning

Turn water heater off. Unplug the water heater from

electrical outlet or disconnect the power supply at

the circuit breaker.

Turn off the water supply to the water heater.

Drain the water heater. See "Draining the Water

Heater" section.

Care Instructions

Air Intake

Vent Exhaust

Cold Water

Supply

Shut-Off

Valve

Drain

Valve

CARING FOR YOUR WATER HEATER

CAUTION:

DO NOT tap or force the filter during removal. This can

deform and/or damage the filter.

Unscrew the water filter from the base of the cold

water inlet line and carefully slide it out of the line.

Clean the water filter under running water. To remove

severe sediment and dirt, use a soft brush.

CAUTION:

DO NOT overtighten the water filter. Overtightening can

deform and/or damage the filter.

Replace the filter in the cold water inlet line and

tighten until it is snug.

Plug in the power cord or reconnect the power

supply at the circuit breaker box.

Air Filter Cleaning

It is recommended the air filter be annually inspected

and cleaned.

DANGER:

Shock Hazard - Removing the front cover panel exposes

you to live electricity. Electric shock will cause death or

serious personal injury.

Remove the plastic covers.

Remove 4 screws and the unit cover panel.

Remove screw, and inspect and clean the air filter.

Reinstall the air filter, 5 screws and the plastic

covers.

Care and Cleaning

Care Instructions

Air Filter

Screw

Preventive Maintenance

WARNING:

Failure to perform routine preventive maintenance

can prevent the water heater from operating properly.

Improper operation can cause carbon monoxide dangers,

excessive water temperatures, and other potentially

hazardous conditions resulting in death, personal injury,

and/or product damage.

Properly maintaining your water heater will ensure

dependable, trouble-free service.

User Preventive Maintenance

Establish and follow a routine preventive

maintenance program. The following suggested

items should be included in your program.

Check and clean the water filter monthly. See “Water

Filter Cleaning” section on this Use and Care Manual

for additional information.

WARNING:

Hot water is released during manual operation of the

relief valve. Make sure all people and animals are clear

from the area before performing this check to prevent

death, personal injury, and/or property damage from hot

drain water. Turn the water heater off. Open a hot water

faucet until cold water is present and then test relief

valve.

• Annually check the operation of the pressure relief

valve annually. Lifting the lever handle on the pressure-

relief valve opens the valve to flush hot water through

the discharge line to the drain. After several gallons

have drained, release the lever handle to close the valve

and stop draining.

NOTICE:

If the pressure relief valve on the hot water heater

discharges periodically, this may indicate a problem

in the water system. Contact the water supplier or a

plumbing contractor to correct the problem. DO NOT plug

the relief valve outlet.

• Inspect and keep the area around the water heater

clear and free of flammable materials, such as gasoline

and other flammable vapors and liquids.

• Visually inspect the water heater for damage and/or

denting. If present, contact a service personnel to verify

proper operation.

• Check for abnormal sound during normal operation

(e.g., hissing or banging noises). Contact a qualified

service technician or plumbing contractor if abnormal

sounds are noted.

• Check all gas and water pipes for leaks. See "Leak

Testing " on this Use and Care Manual.

NOTICE:

– DO NOT operate the water heater if you feel

something is wrong with the unit.

– DO NOT allow children to operate or handle

the unit.

• After inspections, maintenance, and/or cleaning, ensure

proper operation by turning on a hot water faucet.

Professional Preventive Maintenance

It is recommended that a periodic inspection of the water

heater burner, relief valve, air intake filter, water filter, and

venting system be made by a qualified service technician.

Flushing of the heat exchanger is required for maintaining

optimal efficiency. Flushing frequency is based on water

conditions and average usage and should be conducted

annually or as recommended by a professional. Failure to

flush the unit consistently could result in higher operation

costs or premature unit failure.

WARNING:

Certain water conditions can damage the water heater

and may cause defects, malfunctions or failures of the

water heater that are not covered by the limited warranty.

See "Water Quality" on this Use and Care Manual.

Care Instructions

Relief Valve

CARING FOR YOUR WATER HEATER

Care Instructions

CARING FOR YOUR WATER HEATER

Draining the Water Heater

WARNING:

Failure to follow these draining instructions can cause

serious personal injury from scalding and/or product

damage.

Press the "MODE" button. After the LCD displays

"ENABLE/DISABLE", press the "ENTER button.

Press the "▼" or "▲" button until "DISABLE" is

displayed, and press the "ENTER" button.

Turn water heater off. Unplug the water heater from

electrical outlet or disconnect the power supply at

the circuit breaker.

Close the gas shut-off valve.

Open all hot water faucets. Run the water until it is

COLD; then shut off the faucet.

Close the water shut-off valve.

Find the water filter(s) and the water drain plug at

bottom of the water heater.

Only applies to built-in pump models.

Using a suitable container to catch the water, remove

the water drain plug located at bottom of the water

heater, and the water filter(s).

Cold Wa-

ter Supply

Shut-Off

Valve

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

DISABLEENABLE/DISABLE

SETTINGS

BACK ENTER

STATUS SERVICE MODE SETTINGS

BACK ENTER

STATUS SERVICE MODE

DISABLEENABLE/DISABLE

Water

Drain

Plug

Water

Filters

100

CAUTION:

Even when drained properly, a small amount of water will

remain in the water heater. In cold weather conditions,

this water can freeze. If this happens, allow the defrost

protection on the water heater at least 30 minutes to melt

the frozen water. The water heater will not work properly

until this water is thawed.

To put the water heater back in service:

Disconnect drain hose. Make sure the drain valve is

closed.

Reinstall the water filter(s), and the water drain

plug.

Open the water shut-off valve.

Open all hot water faucets and let run until all air

has been purged from the lines. Close all hot water

faucets.

Open the gas shut-off valve(s).

Plug in the power cord or reconnect the power

supply at the circuit breaker box.

Care Instructions

Cold Water

Supply

Shut-Off

Valve

Connect a garden hose to the drain valve on the hot

water outlet line and place the other end in a suitable

drain. Open the drain valve until all the water has

drained from the water heater. Leave water heater as

is until placed back in service.

Draining the Water Heater

CARING FOR YOUR WATER HEATER

101

CARING FOR YOUR WATER HEATER

Draining the Water Heater

Flushing of the Heat Exchanger

Standard Drain Method

Service isolator valve kits may be purchased from

the manufacturer, distributor, or place of purchase.

The kits include two full-port isolation valves to be

used in the inlet and outlet water lines. These kits

provide a means for full diagnostic testing and ease

of system flushing and draining.

Flushing of the heat exchanger is required for

maintaining optimal efficiency. Flushing frequency is

based on water conditions and average usage and

should be conducted annually or as recommended

by a professional. Failure to flush the unit

consistently could result in higher operation costs or

premature unit failure.

Flush kit (RTG20124) is available to conduct flushing

of the heat exchanger. Contact a store where

tankless water heater is purchased to purchase the

flush kit.

For ease of maintenance, the heater can be set

to Flush Mode. When Flush Mode is enabled,

the heater will disable normal operation while

maintaining the inlet water valve open and the

bypass valve closed.

The Flush Mode shall last for a maximum of 2 hours

before the heater automatically returns to normal

operation.

To access Flush Mode, press "SERVICE" and scroll

up or down using the middle two buttons to find the

"FLUSH HEATER?" sub-menu. Press "ENTER" to

confirm.

Within the "Flush-Heater?" sub-menu, scroll up or

down to "YES" and press "ENTER" to confirm. This

will activate Flush Mode.

Follow the instructions at “Draining the Water

Heater” in this use and care manual to drain the

water heater, and close at cold and hot service

valves V3 and V4.

Care Instructions

Water

Outlet

Pressure

Relif Valve

Drain

Cold

Water

Service

Valve

SETTINGS

BACK ENTER

STATUS SERVICE MODE

YES

Hot Service

Valve

Cold Service

Valve

Service

valve for hot

water

Service valve

for cold water

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

120

°F

SETTINGS

BACK ENTER

STATUS SERVICE MODE

115

°F

102

Connect one side of hose of a circulating pump

contained in the flush kit to cold service valve V2,

and the other side to the pump outlet.

Connect one side of the drain hose to hot service

valve V1, and place the other side in the bucket.

Pour no more than 2 gallons of virgin food grade

white vinegar into the bucket, and place the

circulating pump in the bucket.

Open cold and hot service valves V1 and V2.

Connect power to the pump and allow to circulate

vinegar for 45 minutes. After a minimum of 45

minutes unplug the circulating pump

Remove the drain hose from the bucket and route

it to suitable drain. Close cold service valve V2, and

open service valve V4 to flush the water heater with

water. DO NOT open hot water service valve V3

at this time. Allow water to flow out of house for 5

minutes to rinse cleaning solution.

Close hot service valve V1, and open valve V3.

Disconnect both hoses from service valves.

Follow the instructions at “Water Filter Cleaning” in

this use and care manual to clean the water filter.

Press "SERVICE" and select "FLUSH HEATER?"

Press "ENTER" to confirm and select "NO". Press

"ENTER" again to confirm and re-enable normal

operation for the heater.

Flushing of the Heat Exchanger

minutes

Hot Service

Valve

Cold Service

Valve

Hot Service

Valve

Cold Service

Valve

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Cold Service

Valve

Hot Service

Valve

CARING FOR YOUR WATER HEATER

103

Freeze Protection

Leak Sensor (If Equipped)

WARNING:

Failure to drain the water heater can cause serious

personal injury from scalding and/or product damage.

Whenever the water heater may be exposed to

freezing conditions, make sure to completely drain

the water from the unit. See "Draining the Water

Heater.

Freezing conditions come from the venting system

on direct-vent models and from exposure to cold air

models.

All water heaters are equipped with a freeze

protection electric heater. This heater helps to

prevent freezing inside the water heater down to an

outside temperature of approximately -30°F (-35°C)

on indoor installations and approximately -4°F

(-20°C) on outdoor installations. These temperatures

are all based on temperatures without wind.

NOTE:

Models with built-in recirculation pump will activate

recirculation for additional freeze protection (factory

default setting).

The heater only protects the internal components of

the water heater.

NOTICE:

Unplugging or disconnecting the power supply to the

water heater will also disconnect the power to the freeze

protection electric heater.

External piping and valves require additional

freeze protection. One method is to wrap insulation

around the piping and valves.

Another method is to turn on a hot water faucet and

leave a small amount of water running at a faucet.

This will protect the water heater, piping, and valves

from freezing.

Running Water Freeze Protection

Turn water heater off. Unplug the water heater from

electrical outlet or disconnect the power supply at

the circuit breaker.

Close the gas shut-off valve(s).

Open a hot water faucet slightly until the water

stream is approximately 1/8 in. (0.3 cm). Be sure to

check the flow periodically.

CARING FOR YOUR WATER HEATER

Select models are equipped with an internal leak

sensor, installed along the bottom of the water

heater. Upon detecting water, this sensor will prevent

heater function and alert the user with "A017" on the

control display.

If water has been detected outside of the heater,

contact a dealer or qualified service technician

immediately. If no leak is noted but the "A017"

code is still present, a 24-hour temporary override

is accessible through the control display. To access

this override, first click "SETTINGS" and use the

up and down arrows to locate "LEAK OVERRIDE".

Press "ENTER" to confirm, then select "YES" and

click "ENTER once more to confirm. For the next

24 hours, the heater can be used normally. If after

24 hours the "A017" error code re-appears, visually

inspect the leak sensor to verify that it is dry.

IF INSTALLING THE OUTDOOR CONVERSION KIT (RTGH-SX),

THIS LEAK SENSOR MUST BE DISCONNECTED

104

Vacation and Extended Shutdown

WARNING:

Failure to drain the water heater can cause serious

personal injury from scalding and/or product damage.

If the water heater is to remain idle for an extended

period of time, the power and water to the heater

should be turned off.

The water heater and piping should be drained if

they might be subjected to freezing temperatures.

See “Freeze Protection” section on this Use and Care

Manual.

After an extended shutdown, the water heater’s

operation and controls should be checked by a

qualified service technician.

Troubleshooting Chart

The information in the following troubleshooting

chart may help you diagnose and/or fix a problem

you may be experiencing. Please review this chart

before calling for service assistance.

DANGER:

Shock Hazard – Make certain power to the water heater

is OFF before removing protective cover for any reason.

Electric shock will cause death or serious personal injury.

WARNING:

For Your Safety, DO NOT attempt repair of electrical wiring,

gas piping heater control, burners, vent connectors, or

other safety devices. Refer repairs to a qualified service

technician heater.

Problem Possible Cause Solution

Not enough or no hot water.

1. Unit is not ON. 1. Plug in the power cord or reconnect the

power supply at the circuit breaker box.

2. Water shut-off valve is not completely

opened.

2. Check shut-off valve and open com-

pletely.

3. Hot water faucet is not completely

opened.

3. Open hot water faucet completely.

(The main burner goes off when incom-

ing water volume is inadequate.)

4. Water piping is frozen. 4. Allow piping to thaw.

5. Electrical power is disconnected or

water supply is shut off.

5a. Plug in the power cord or reconnect

the power supply at the circuit breaker

box.

5b. Completely open the water supply valve.

(Inadequate water volume will cause the

main burner to turn off.)

6. The temperature may be set too low. 6. Increase the temperature setting.

7. Mixing valve malfunctions (if

applicable).

7. Check and replace the mixing valve.

8. Error code displayed on the heater

control.

8. See “Service Error Code Chart” on

page 107. If required, contact a

qualiﬁed service technician.

9. Not enough water demand. 9. Increase the hot water ﬂow at the

faucet.

10. Water ﬁlter is clogged or dirty. 10. Clean the water ﬁlter. (See page 96)

11. Fixture aerator is clogged or dirty. 11. Clean the aerator.

12. Scale buildup in the heat exchanger. 12. Check for error code. If required,

contact a qualiﬁed service technician.

13. Hot and cold water lines reversed. 13. Reverse the water lines.

Care Instructions

3 94 11

CARING FOR YOUR WATER HEATER

105

Care Instructions

CARING FOR YOUR WATER HEATER

Problem Possible Cause Solution

Water not hot enough.

1. The temperature may be set too low. 1. Increase the temperature setting at

the remote control.

2. The gas valve is not completely opened. 2. Check and completely open the gas valve.

3. Gas supply pressure is low. 3. Contact your gas utility company or gas

contractor to verify the gas meter and

gas piping size.

4. Bleed-over in one of the hot water

ﬁxtures.

4. Contact a dealer or a qualiﬁed service

technician.

Water too hot.

1. Temperature is set too high. 1. Decrease the temperature setting at

the remote control.

2. Water shut-off valve is not completely

opened.

2. Check and completely open the water

shut-off valve.

3. Small amount of water has been heated. 3. Increase the hot water ﬂow at the

faucet to allow more water to ﬂow

through the water heater.

Fan continues to rotate after the hot water

faucet is closed.

The post-purge cycle clears ﬂue gases. Normal operation.

Troubleshooting Chart

106

Care Instructions

Service Error Code Chart

Your water heater has an electronic diagnostic

system built into it. When the water heater finds a

problem, it displays an error code in the LCD on the

User Interface. The chart on the next page lists the

error codes along with their possible problem and

solution. Using this chart may help you diagnose

and/or fix a problem you may be experiencing.

Please refer to this chart before calling for service

assistance.

DANGER:

Shock Hazard – Make certain power to the water heater

is OFF before removing protective cover for any reason.

Electric shock will cause death or serious personal injury.

WARNING:

For Your Safety, DO NOT attempt repair of electrical wiring,

gas piping, heater control, burners, vent connectors, or

other safety devices. Refer repairs to a qualified service

technician.

Clearing Error Codes

When an error code is displayed:

Turn off all the hot water faucets.

Press the “SERVICE” button.

Press the “ENTER” button.

Press the “▼” or “▲” button until “Clear Alarms?” is

displayed, and press the “ENTER” button.

Press the “▼” or “▲”button until “Yes” is displayed,

and press the “ENTER” button. To exit this setting,

press “BACK” button until the initial screen is

displayed.

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Current Alarms

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Clear Alarms?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Current Alarms

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Clear Alarms?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Current Alarms

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Clear Alarms?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

SETTINGS

BACK ENTER

STATUS SERVICE MODE

SET POINT

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Current Alarms

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Clear Alarms?

SETTINGS

BACK ENTER

STATUS SERVICE MODE

Yes

If the error code is still shown:

1. Turn off the hot water faucet.

2. Turn off the water heater.

3. Make note of the displayed error code and call

for service assistance. See “Call for Assistance”

section on this Use and Care Manual.

NOTICE:

If the displayed error code is not listed in the chart,

immediately turn off the water heater and call for service

assistance.

CARING FOR YOUR WATER HEATER

107

Service Error Code Chart

Care Instructions

CARING FOR YOUR WATER HEATER

1. All questions, adjustments, repairs, and/or

routine maintenance should be directed to your

installer, plumbing contractor, or licensed service

agent. If your contacts have moved or are not

available, please refer to the telephone directory,

commercial listings, or local utility company for

qualified service assistance.

2. If your problem has not been solved to your

satisfaction, contact the Manufacturer National

Service Department at the following address:

Manufacturer National Service Department

800 Interstate Park Drive

Suite 700

Montgomery, AL 36109

Phone: 1-866-720-2076

When contacting the manufacturer, the following

information will be requested:

A. Model and serial number. (See page 10 or the

ratings plate on the inside of the top panel of the

water heater.)

B. Address where the water heater is located.

C. Name and address of installation contractors

(page 8) and all qualified service companies that

have worked on the water heater.

D. Original installation date. (See page 8.)

E. Dates any service or preventive maintenance was

performed.

F. Details of the persisting problem.

G. List of businesses that have tried to fix this

problem, along with dates of service.

Call for Assistance

IF YOU NEED SERVICE

Service Information

Error Code Possible Cause Solution

A01L Water heater has buildup of lime deposits. Contact a dealer or qualiﬁed service technician.

A011 The gas shut-off valve is not fully opened.

Check shut-off valve is open completely and venting/air supply is

not blocked"

A012

Gas service has been interrupted. Contact your gas utility company.

LP gas is running low (LP models only). Reﬁll or replace your LP gas container.

A014 Water heater is overheating. Contact a dealer or qualiﬁed service technician.

A017 Leak sensor has detected water. See Leak Sensor section of this manual.

A029 Blocked condensate line. Contact a dealer or qualiﬁed service technician.

A031 Faulty inlet water thermistor. Contact a dealer or qualiﬁed service technician.

A032 Faulty heat exchanger thermistor. Contact a dealer or qualiﬁed service technician.

A033 Faulty outlet water thermistor. Contact a dealer or qualiﬁed service technician.

A035 Improper thermistor connection. Contact a dealer or qualiﬁed service technician.

A036 Faulty exhaust thermistor. Contact a dealer or qualiﬁed service technician.

A055 Faulty gas valve. Contact a dealer or qualiﬁed service technician.

A061 Faulty blower motor. Contact a dealer or qualiﬁed service technician.

A063 (Built-in recirculation) pump abnormality. "SR models" only. Contact a dealer or qualiﬁed service technician.

A065 Faulty water ﬂow solenoid. Contact a dealer or qualiﬁed service technician.

A066 Faulty bypass solenoid. Contact a dealer or qualiﬁed service technician.

A070 Faulty control board. Contact a dealer or qualiﬁed service technician.

A071 Faulty gas solenoid valve. Contact a dealer or qualiﬁed service technician.

A072 Flame detected before ignition. Contact a dealer or qualiﬁed service technician.

A082 Software error. Contact a dealer or qualiﬁed service technician.

A090

Air intake or vent exhaust opening may be blocked. Remove any blockage. (Air intake requires 12 in [30 cm] of clearance.)

The vent pipes on the vent termination may not be connected properly. Contact a dealer or qualiﬁed service technician.

Blocked vent termination or inlet air ﬁlter. Contact a dealer or qualiﬁed service technician.

T113 Not enough hot water to operate the unit. Increase the water ﬂow from the fuxtures.

T111

Reminder of ﬂushing the heat exchanger and/or replacing the water

tratment ﬁlter

Contact a dealer or qualiﬁed service technician.

"*The listed causes are only one possibility for each error code. Additional troubleshooting may be requested before it is confirmed that a replacement

part is needed."

108

IF YOU NEED SERVICE

Parts Ordering

WARNING:

For your safety, DO NOT attempt to disassemble, repair, or

replace any portion of this unit. Refer all repairs, service,

and/or adjustments to qualified service personnel.

Address all parts orders to the distributor or store

where the water heater was purchased.

All parts orders should include:

1. The model and serial number of the water heater

from the rating plate.

2. Specify the gas type (natural or LP) as marked on

the rating plate.

3. Parts description (as shown below) and number

of parts desired.

Ref # Description

1 Control Board

2 Gas Valve

3 Burner Mesh

4 Blower Assembly

5 Venturi

6 Gas Inlet Connector

7 Water Control Valve

8 Water Inlet Connector

9 Inlet Water Filter

10 Hot Outlet Connector

11a Display Assembly "Non- WiFi"

11b Display Assembly "WiFi"

12 Condensate Trap

Ref # Description

13 Air Intake Connector

14 Flue Connector

15 Front Cover

16 Cabinet

17 Exhaust Duct Assembly

18 Gas Orifice Block

19 Burner Header

20 Gas Inlet Pipe

21 Air Filter

22 Ignitor

23 Flame Rod

24 Cover Screws

25 Plastic Screw Covers

Parts

Direct-Vent Gas

Components

109

IF YOU NEED SERVICE

Direct-Vent Gas Components Recirculation Model

Ref # Description

1 Control Board

2 Gas Valve

3 Burner Mesh

4 Blower Assembly

5 Venturi

6 Gas Inlet Connector

7 Water Control Valve

8 Water Inlet Connector

9 Water Filter

10 Hot Outlet Connector

11 Display Assembly "WiFi"

12 Condensate Trap

13 Air Intake Connector

14 Flue Connector

Ref # Description

15 Front Cover

16 Cabinet

17 Exhaust Duct Assembly

18 Gas Orifice Block

19 Burner Header

20 Gas Inlet Pipe

21 Recirculation Connector

22 Recirculation Pump

23 Recirculation Pump Piping

24 Air Filter

25 Ignitor

26 Flame Rod

27 Cover Screws

28 Plastic Screw Covers

Parts

110

Parts Ordering

WARNING:

For your safety, DO NOT attempt to disassemble, repair, or

replace any portion of this common venting system. Refer

all repairs, service, and/or adjustments to qualified service

personnel.

Address all parts orders to the distributor or store

where the common venting system was purchased.

All parts orders should include:

1. The model and serial number of the water heater

from the rating plate.

2. Specify the gas type (natural or LP) as marked on

the rating plate.

3. Parts description (as shown below) and number

of parts desired.

RTG20351A - 6" Back to Back Starter Exhaust Kit

Rheem Part Number

Quantity

Part Description

RTG20350A 1 6" Back to Back Exhaust Branch Tee

SP20918AW 1 6" Support Clamp

SP20918H 1 Centrocerin (50 ml)

RTG20360 2 2" Straight Pipe, 1'

SP21092G 4 2" Connector Ring

RTG20359 2 2", 45 Degree Elbow

SP20918AG 1 6" Horizontal Drain Fitting

SP20918C 1 Universal Ball Valve Siphon

RTG20351B - 6" Back to Back Starter Intake Kit

Rheem Part Number

Quantity

Part Description

RTG20350B 1 6" Back to Back Intake Branch Tee

SP20918AW 1 6" Support Clamp

SP20918H 1 Centrocerin (50 ml)

RTG20359 2 2", 45 Degree Elbow

SP20918AH 1 6" Tee Cap

IF YOU NEED SERVICE

Parts

111

IF YOU NEED SERVICE

Parts Ordering

RTG20353A - 6" Inline Starter Exhaust Kit

Rheem Part Number

Quantity

Part Description

RTG20350C 2 6" Inline Exhaust Branch Tee

SP20918AW 1 6" Support Clamp

SP20918H 1 Centrocerin (50 ml)

RTG20361 2 2" Straight Pipe, 2'

SP21092G 4 2" Connector Ring

RTG20365 2 2", 87 Degree Elbow

SP20918AG 1 6" Horizontal Drain Fitting

SP20918C 1 Universal Ball Valve Siphon

RTG20352A - 6" Back to Back Extension Exhaust Kit

Rheem Part Number

Quantity

Part Description

RTG20350A 1 6" Back to Back Exhaust Branch Tee

SP20918AW 1 6" Support Clamp

RTG20361 2 2", Straight Pipe, 2'

SP21092G 4 2", Connector Ring

RTG20359 2 2", 45 Degree Elbow

RTG20352B - 6" Back to Back Extension Intake Kit

Rheem Part Number

Quantity

Part Description

RTG20350B 1 6" Back to Back Intake Branch Tee

SP20918AW 1 6" Support Clamp

RTG20359 2 2", 45 Degree Elbow

Parts

112

Parts Ordering

RTG20353B - 6" Inline Starter Intake Kit

Rheem Part Number

Quantity

Part Description

RTG20350D 2 6" Inline Intake Branch Tee

SP20918AW 1 6" Support Clamp

SP20918H 1 Centrocerin (50 ml)

RTG20359 2 2", 45 Degree Elbow

SP20918AH 1 6" Tee Cap

RTG20354A - 6" Inline Extension Exhaust Kit

Rheem Part Number

Quantity

Part Description

RTG20350C 1 6" Inline Exhaust Branch Tee

SP20918AW 1 6" Support Clamp

RTG20362 1 2", Straight Pipe, 3'

SP21092G 2 2", Connector Ring

RTG20365 2 2", 87 Degree Elbow

RTG20354B - 6" Inline Extension Intake Kit

Rheem Part Number

Quantity

Part Description

RTG20350D 1 6" Inline Intake Branch Tee

SP20918AW 1 6" Support Clamp

RTG20359 1 2", 45 Degree Elbow

IF YOU NEED SERVICE

Parts

Rheem RTGH-S84I IKONIC Super High Efficiency Condensing Tankless Gas Water Heater

Product's Documents

Use and Care Manual

Specifications

Rheem RTGH-S84I Questions and Answers