Rheem ECOH160DVLN-3 Performance Platinum Super High User Manual

Do not destroy this manual. Please read carefully

and keep in a safe place for future reference.

CERTIFIED

Print 2D

Bar Code

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www.ahridirectory.org

ULTRA

Low NOx

Emissions

SCAQMD Rule 1146.2

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.

SUPER HIGH EFFICIENCY CONDENSING

TANKLESS WATER HEATER

USE AND CARE MANUAL

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.

With Installation Instructions

for the Installer

Condensing Direct Vent

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

157,000 Btu/hr and 120,000 Btu/hr Models

AP21820 Rev 03

Important Safety Information

Safety Precautions �� 2 – 8

Product Information

Product Information �� 8

Specifications �� 9, 10

Flow Rate vs Pressure Drop ��11

General Descriptions ��12, 13

Installation Instructions

Standards Compliance �� 15

Choosing a Location ��15, 16

Product Inspection ��17

Water Heater Installation��17 – 19

Venting & High-Altitude Adjustments ��20 – 36

Water Quality/Supply ��37 – 41

Condensate ��41

Gas Supply ��42 – 47

Electrical Wiring �� 47, 48

Insulation Blankets and Installation Precautions��49

Installation Checklist �� 50

Safety

Using Your Water Heater

Activating the Water Heater ��51, 52

Setting the Water Temperature ��53 – 56

WiFi Setup ��56

Recirculation Pump Control ��57 – 62

Water Saving Control Option �� 63, 64

Caring for Your Water Heater

Water Heater Inspections �� 65, 66

Care and Cleaning ��67, 68

Preventive Maintenance �� 69

Draining the Water Heater��70 – 72

Freeze Protection �� 72

Vacation and Extended Shutdown ��73

Troubleshooting Chart �� 73, 74

Service Error Code Chart �� 75, 76

Call for Assistance ��76

Maintenance Notice �� 77, 78

Parts Replacement��79

Warranty Information��80, 81

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.

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 it is

properly vented and has the air supply piping 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 16 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 InnoFlue® 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 26 & 27

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

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

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 up to 140°F (60°C) can

be achieved with the remote control. Only

qualified service personnel should perform this

adjustment. Only factory-authorized remote

control(s) 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 the repair of any electrical wiring, gas

piping, remote 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 or vice versa. The water heater must only

use the fuel type in accordance with the listing on the

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. 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 the repair of any

electrical wiring, gas piping, remote 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 76 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" in 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.

Preoperating 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

Speciﬁcations – Direct-Vent Models

25.7 in

(637 mm)

23.58 in

(600 mm)

3.31 in

(84 mm)

5.89 in

(150 mm)

5.54 in

(141 mm)

17.65 in

(448 mm)

5.43 in

(138 mm)

4.36 in

(111 mm)

2.9 in

(74 mm)

2.85 in

( 72 mm)

2.04 in

(52 mm)

2.78 in

(71 mm)

9.42 in

(239 mm)

6 in

(152 mm)

Front View

Top View

Bottom View

PRODUCT INFORMATION

Speciﬁcations

Product Information

The following product information 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

Back side of

the cover

PRODUCT INFORMATION

Product Information

Pressure Drop (PSI)

1 2 3 4 5 6 7 8

Water Flow Rate (GPM)

Pressure Drop Curve

Pressure Drop (ft of head)

0 10 20 30 40 50

Water Flow Rate (GPM)

Delta T - Temperatu

Temperature Rise Curve

RTGH-90DVL-3

RTGH-68DVL-3

60 70 80 90 100 110

re Rise (°F)

RTGH-95DVL-3

RTGH-84DVL-3

The graphic below illustrates the pressure drop across the water heater. Please ensure ample water supply

pressure is available to ensure the best performance.

PRODUCT INFORMATION

General Descriptions

Typical Direct-Vent Water Heater

(Shown Without Venting)

Product Information

Water Filter

Built-In

Display

Manual Gas

Shut-Off Valve

Union

Power

Supply

Cord

Sediment Trap

Service Valve

To Suitable

Drain /

Neutralizer

To Suitable

Drain

Valve

Condensate

Pipe*

To Hot Water

Faucet(s)

Relief

Valve

Cold Water Supply

Shut-Off Valve

Cap

Manual Gas

Supply Line

Shut-Off Valve

General Descriptions

Product Information

Water Filter

Built-In

Display

WiFi Control &

Harness

Manual Gas

Shut-Off Valve

Union

Power

Supply

Cord

Sediment Trap

Service Valve

To Suitable

Drain/

Neutralizer

To Suitable

Drain

Valve

Condensate

Pipe*

To Hot Water

Faucet(s)

Relief

Valve

Cold Water Supply

Shut-Off Valve

Cap

Manual Gas

Supply Line

Shut-Off Valve

PRODUCT INFORMATION

Typical Outdoor Water Heater

(Outdoor Conversion Kit Required - sold separately)

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 or property

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:

DO NOT connect power until venting installation is complete

(see Venting installation).

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" in this Use and Care Manual.

General

Exhaust Vent Pipe

Air Intake Pipe

0" min.

(0 mm)

12"

(300 mm)

Minimum

Upward Slope

to Termination

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.

• 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)

12" min.

(300 mm)

0" min.

(0 mm)

1/2" min.

(13 mm)

1/2" min.

(13 mm)

(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

recreational vehicle, 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

Washers

Mounting Bracket

Pressure Relief Valve

(Some models only)

INSTALLATION INSTRUCTIONS

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 (cont.)

Suitable

Drain

Suitable

Drain

To Hot Water

Faucet(s)

Condensate

Pipe*

Union

Relief

Valve

Sediment

Trap

Water

Filter

Manual Gas

Supply Line

Shut-Off Valve

Manual Gas

Shut-Off

Valve

Union

Cap

Cold Water

Supply Shut-Off

Valve

Service

Valve

(supplied)

with some

models)

Power Supply

Cord

Outside

Wall

Wall Plate

(Recommended)

90°

Elbow

Air

Intake

Pipe

Upward Slope to

outside termination

Exhaust Vent Pipe

90°Elbow

Drain

Valve

Condensate Collector

Condensate Trap

To Drain: Dispose of condensate

in accordance to local codes.

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.

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

cord, while the outdoor models require hard-wiring

or the addition of a plug.

Attach the mounting bracket to the wall and secure

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

that it can support the weight of the water heater.

NOTICE:

The image above may differ in appearance from your water

heater.

Align the groove on the back of the water heater to

the tongue on the mounting 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 top and

lower mounting bracket to the wall.

NOTICE:

DO NOT connect power until venting installation is complete

(see Venting installation).

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.

WARNING:

Refer to page 16 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 must terminate

outside as described in these instructions. 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:

ABS is not permitted for exhaust vent in Canada

Approved Polypropylene Vent Manufacturer/Trade Name:

*Refers to variations in nominal size.

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

Galvanized, Aluminum, B-Vent, or any flexible vent.

INSTALLATION INSTRUCTIONS

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

SP20285

SP20286

SP20245

SP20897

PVC

Schedule 40,

ASTM F-441

Schedule 40,

ASTM F-441,

and CPVC 4120,

ASTM-D2846

Schedule 40,

ASTM F-438

SP21025

SP21026

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

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

ISAAL0202

ISNRV****

IASJBVS

ISLPT**** or ISTT****

INSTALLATION INSTRUCTIONS

Appropriate dip switch adjustment shall be required

to allow certain vent length. There are 4 vent

configuration settings, A-0, A-1, A-2, and A-3 settings

at 0-2000 ft (0-610 m) elevation.

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 (inlet and

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

26 and 27 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

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

*The altitude settings for installations at levels greater than 2000 ft (610 m), can be found in the "High-Altitude

Dip Swich Adjustments" section of this manual. DIP switch changes will be necessary at higher altitudes.

SINGLE UNIT: MAX. EQUIVALENT

VENT LENGTHS - STRAIGHT PIPE

Number of 90° Elbows

Max Length 2"

Straight Pipe

Max Length 3"

Straight Pipe

0 60 ft. (18.3 m) 150 ft. (45.7 m)

1 54 ft. (16.5 m) 144 ft. (43.9 m)

2 48 ft. (14.6 m) 138 ft. (42.7 m)

3 42 ft. (12.8 m) 132 ft. (40.2 m)

4 36 ft. (11.0 m) 126 ft. (38.4 m)

5 30 ft. (9.1 m) 120 ft. (36.6 m)

6 24 ft. (7.3 m) 114 ft. (34.7 m)

EQUIVALENT FT. OF ELBOWS

2" Pipe 3" Pipe

90° 6 ft. (1.83 m) 6 ft. (1.83 m)

45° 3 ft. (0.9 m) 3 ft. (0.9 m)

INSTALLATION INSTRUCTIONS

Venting

Vent Length and High Altitude DIP switch Adjustments

A-0 setting is default and factory setting. All dip

switches are off.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Remove the front cover panel on the water heater.

Find DIP Switch 1 and 2 located in the top-right

portion of the control board.

The factory settings for this switch should all be in

the OFF position (DOWN), which is the A-0 setting.

For longer vent lengths and altitudes above 2000 ft.

(610 m), refer to the table below for the necessary

DIP switch settings. These setting must be changed

to ensure proper operation.

NOTICE

DO NOT alter any other DIP switch settings. Please

contact technical service listed on page 76 of this

use and care manual if you have any questions of DIP

switch adjustments.

As set

from factory

MIN MAX ADJ

1 2 3 4

Control

Board

DIP

Switch

"MAX"

button

"ADJUST"

button

"MIN"

button

DIP

Switch

3" VENT SYSTEM DIAMETER

Identify Vent Length

IDENTIFY ALTITUDE

0 - 2,000 ft 2,001 - 5,400 ft 5,400 - 7,800 ft

Dip Dip Dip

6 to 45 feet (1.8 - 13.7 meters) A-0 (Factory Setting) B-0 C-0

45 to 150 feet (13.7 to 45.7 meters) A-1 B-1 C-1

2" VENT SYSTEM DIAMETER

Identify Vent Length

IDENTIFY ALTITUDE

0 - 2,000 ft 2,001 - 5,400 ft 5,400 - 7,800 ft

Dip Dip Dip

MUST CHANGE FACTORY DIP SETTING A-0 (Factory Setting)

6 to 21 feet (1.8 to 6.4 meters) A-1 B-1 C-1

21 to 42 feet (6.4 to 12.8 meters) A-2 B-2 C-2

42 to 60 feet (12.8 to 18.3 meters) A-3 B-3 C-3

1 2 3 4

SECTION HIGH-ALTITUDE

Sea Level (A Setting) 0-2000 ft (0 m - 610 m)

B Setting 2001 ft - 5400 ft (610 m - 1650 m)

C Setting 5401 ft - 7800 ft (1650 m - 2377 m)

INSTALLATION INSTRUCTIONS

Replace the front cover panel on the water heater.

Turn on the gas and water to the water heater by

opening the shut-off valves.

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.

This water heater requires the correct DIP switch

adjustments per vent length for proper operation.

Incorrect DIP switch adjustments may cause improper

water heater operation resulting in serious injury or death.

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.

It is recommend to have a vent length as short

as possible. Input rate of the water heater

decreases if there is restriction (pressure drop) in

the venting system.

The following table shows approximate input rate

reduction. Actual input rate reduction may be

different at each installation.

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.

Venting for Direct-Vent Water Heater

Venting

Setting Vent Size Min Vent Length Max Vent Length

A-0

3" 0% 5%

2" --- ---

A-1

3" 5% 10%

2" 5% 10%

A-2 2" 15% 20%

A-3 2" 20% 25%

Venting for Direct-Vent Water Heater

INSTALLATION INSTRUCTIONS

Venting

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 16.

• Recommend use of condensation trap/collar on

the air intake to prevent water entering the heater

cabinet

• 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.

See page 25 for additional requirements for the

Commonwealth of Massachusetts.

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.

When the water heater is installed above 2000 ft.

(610 m), the settings on the DIP switch located on

the control board need to be changed per vent

length and altitude. If these settings are not changed,

the water heater may not function properly.

Refer to "Venting for Direct Vent Water Heaters" on

page 22 for the vent lengths at each setting.

NOTICE:

DO NOT alter any other DIP switch settings. The manifold

pressure will be reduced accordingly.

Please contact technical service listed on page 76 of

this use and care manual if you have any questions

of high altitude DIP switch adjustments.

WARNING:

This water heater requires the correct DIP switch

adjustments per vent length and altitude for proper

operation. Incorrect DIP switch adjustments may cause

improper water heater operation resulting in serious injury

or death.

NOTICE:

It is recommend to have a vent length as short as possible.

Input rate at high altitude naturally is derated. In addition

to that, input rate of the water heater decreases more if

there is restriction (pressure drop) in the venting system.

Refer to input rate reduction table due to vent length on

page 23. Actual input rate reduction may be different at

each installation.

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.

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.

NOTE: For the State of Massachusetts, use only

plastic piping, fittings and vent terminations as

specified in this manual which are approved by the

Massachusetts Board of State Examiners of Plumbers

and Gas for venting of appliances (see link below):

https://licensing.reg.state.ma.us/pubLic/pl_products/

pb_pre_form.asp

INSTALLATION INSTRUCTIONS

Venting

INSTALLATION INSTRUCTIONS

Venting

The following charts detail the minimal dimensional information needed to determine the proper location of the vent terminal for direct

vent and outdoor tankless water heaters.

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

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

In accordance with the current

CSA B149.1 Natural Gas and Propane Installation Code

In accordance with the 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 oor.

Canadian Installations

US Installations

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 ft (1.2) below or to side of opening; 1 ft

(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 ft (1.2) below or to side of opening; 1 ft

(300 mm) 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 feet (2.13 m) for mechanical draft systems

(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) ‡

Horizontal Vent Terminal Location for Other than Direct Vent/Outdoor Heater

Venting for Direct-Vent Water Heater

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater

Venting

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

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

US Installations

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 ≤ 50,000 Btuh (15 kW),

• 12 in (30 cm) for appliances > 50,000 Btuh

(15 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 ≤ 50,000 Btuh (15 kW),

• 12 in (30 cm) for appliances > 50,000 Btuh

(15 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 feet (2.13 m) for mechanical draft systems

(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) ‡

In accordance with the current

CSA B149.1 Natural Gas and Propane Installation Code

In accordance with the 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 oor.

Horizontal Vent Termination Location for Direct-Vent Water Heater

Venting for Direct-Vent Water Heater (cont.)

Venting

INSTALLATION INSTRUCTIONS

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

• 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 5.5 inches (14 cm) and a maximum of 24

inches (61 cm) apart horizontally.

– Install indoor and outdoor water heaters such that air

inlet and flue outlet are above anticipated snow level.

Rising moisture will collect under eaves.

Inside

Corner

Caulk

If sot vent is too close,

block o 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)

5.5”to 24 “

(14 cm to 61cm)

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)

12"

(300 mm)

Venting

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

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 InnoFlue

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 InnoFlue® PP.

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

Horizontal Vent Installation (cont.)

Fasteners will vary depending on the wall type.

For particle board or

composite sheathing, use

4 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 4 #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 kits one above the other.

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 5.5 inches (14 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

exhaust vent 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 flue outlet and air intake.

Venting

2” PVC pipes

Locking bands

Venting

INSTALLATION INSTRUCTIONS

Venting for Direct-Vent Water Heater (cont.)

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

Optional vent diagram

(no kit required)

Exhaust Vent

Pipe

Air Intake

Pipe

Inspection

Access Panel

(Optional)

Inspection

Access Panel

(Optional)

Ceiling

from wall

is recommended

Upward Slope

to Termination

Flat

Termination

Kit

Air Intake

Vent

Exhaust

Vent

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)

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

Horizontal Vent and Combustion, Air-Inlet Alternate

Vent Riser Terminal Installation

INSTALLATION INSTRUCTIONS

Read these instructions thoroughly and make sure

you understand all steps and procedures before

proceeding with the installation.

Determine the locations for the vent and combustion

air-inlet terminals then make two (2) holes through

the exterior wall to accommodate the vent and

combustion air-inlet pipes.

The horizontal distance between the vent and

combustion air-inlet terminal centerlines must be

from 12 in. (30.5 cm) minimum to 36in. (91.4 cm)

maximum.

The vertical distance between the outlet of the vent

terminal to the outlet of the combustion air-inlet

terminal must be from 0 in. (0 cm) minimum to 36 in.

(91.4 cm) maximum.

WARNING:

The vent terminal must always be installed at the same

height or vertically higher than the combustion air-inlet

terminal.

Maintain a minimum distance from the outlets of the

vent and combustion air-inlet terminals of not less

than 12 in. (30.5 cm) above grade or average snowfall

whichever is greater.

IMPORTANT:

The vent terminal must always be installed at the same

height or vertically higher than the combustion air-inlet

terminal.

Insert lengths of vent and combustion air-inlet pipes

through the wall as shown.

Allow sufficient length of pipe to extend beyond the

exterior wall of the building for attachment of the

vent riser assemblies as shown.

Place the supplied 1/2 in. (1.3 cm) mesh metal screen

inside exhaust vent terminal fitting (optional).

NOTICE:

For cold climates the screen may be removed.

Connect the vent riser assemblies to the vent and

combustion air-inlet pipes which are extending out of

the building.

Ensure that the back of the 90° elbows are flush

with the outside wall surface and that the vent and

combustion air-inlet terminations of the vent risers

are parallel with the outside wall.

IMPORTANT:

Remember to include the additional 90° elbows and vertical

height of vent and combustion air-inlet pipes of the vent

riser when calculating the maximum equivalent vent

and combustion air-inlet system lengths. The maximum

equivalent vent and combustion air-inlet system lengths

must be as speciﬁed by the tables shown in the Use and

Care Manual.

The vent and combustion air-inlet terminations are

not included in the equivalency calculations.

Complete the installation of the remainder of the vent

system and attach it to the vent connector fitting on

the water heater's blower assembly.

Horizontal sections of the vent system must slope

downward toward the water heater a minimum of 1/8

in. per foot (10 mm per m).

DO NOT use unequal diameters of pipe and fittings

for the vent and combustion air-inlet systems except

as defined previously.

NOTICE: The difference between the vent and

combustion air-inlet system equivalent lengths must

be no greater than 5 ft. (1.5 m).

Complete the installation of the remainder of the

combustion air-inlet system and attach it to the

combustion air-inlet connector fitting on the water

heater's combustion air-inlet tube assembly.

Support vertical and horizontal lengths of the vent

and combustion air-inlet systems as previously

mentioned.

90° Vent

Terminal Elbow

90° Combustion

Air-Inlet Terminal Elbow

*Wind Vane

Mesh

Screen

Inside

(Optional)

Securing

Strap

(Optional)

0 in. (0 cm) min.

36 in. (91.4 cm) max.

12 in. (30.5 cm) min.

36 in. (91.4 cm) max.

Termination Openings

- 12 in. (30.5 cm)

min. above grade or

anticipated snow level

*For installations using 3 in. (7.6

cm) pipe and fittings, a 90 elbow

equipped with a wind vane

deflector must be used for the

combustion air-inlet terminal.

Contact Manufacture’s National

Service Department for the elbow.

Venting

INSTALLATION INSTRUCTIONS

Vertical Vent Installation

WARNING:

Improper vent installation can result in death, personal

injury, product damage, and/or poor performance.

NOTICE:

Only Rheem-approved AND 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 23. Vertical supports are required every 4 ft. (1.2

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

vertical, 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” 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

Venting

INSTALLATION INSTRUCTIONS

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/maximum horizontal dis-

tance between vent terminals

5.5 in. (14 cm)/24 in. (61 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

Standard Vertical Vent Termination

Venting

Adjustable Roof Flashing

Support Clamp

Upward Slope

Support Hanger

Air Intake

Pipe

Exhaust Vent

Pipe

Optional

Venting for Direct-Vent Water Heater (cont.)

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

Upward Slope

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

Scale Prevention Device RTG20246 RTG20247

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

Plumbing

INSTALLATION INSTRUCTIONS

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.

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 40 psi (276 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 40 psi (276 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

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.

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.

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 a minimum

of 40 psi (276 kPa).

Install a COLD water shut-off valve near the inlet

line on 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.).

Install a service valve on 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 supplied with this water heater must

be installed as shown below.

• Manual operation of relief valves should be performed at

least once a year.

• If the relief valve on the system discharges periodically, a

problem exists. 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 Supply (cont.)

Relief

Valve

Union

Cold Water Supply

Cold Water

Supply Inlet

Hot Water

Supply Outlet

Relief Valve

Discharge Line

Pressure

Relief Valve

Pressure

Relief Valve

Cold Water

Service Valve

Cold Water

Service Valve

Water

Inlet

Water

Inlet

Water

Outlet

Water

Outlet

Hot Water

Service Valve

Hot Water

Service Valve

Drain

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.

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

Cold Water

Service Valve

Hot Water

Service Valve

Pressure

Relief Valve

Pressure

Relief Valve

Water

Outlet

Water

Outlet

Water

Inlet

Water

Inlet

Drain

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

does not accumulate inside the water heater. 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.

If the condensate drain gets blocked, an error code

will display on the remote control. If this occurs, the

condensate drain must be cleared.

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

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. 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

Union

Manual Gas

Supply Line

Shut-O Valve

Cap

Sediment Trap

Manual Gas

Shut-O Valve

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 pilot outages, 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). For hybrid gas systems,

high pressure main lines with regulators at the

appliances, gas systems piped with corrugated

stainless steel tubing (CSST), or Propane gas

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

)

Gas Supply

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. 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

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.

Specic 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.

Specic 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.

Specic 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.

Specic 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 the manual gas appliance shut-off valve to the

gas connection at the water heater.

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

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

INSTALLATION INSTRUCTIONS

Gas Supply

Electrical

INSTALLATION INSTRUCTIONS

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. DO NOT 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 direct-vent gas models come with a 3-prong

power cord. Only use this power cord and a

matching grounded electrical outlet.

All outdoor gas models DO NOT come with a power

cord. Only hard-wire to an appropriate power outlet

with a ground terminal.

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.

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

7,800 ft. (610 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 “Vent Length and High-Altitude DIP

Switch 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

１

①

③ ④

②

③ ①

②④

ＧＮＤ

ＩＧ

Ｗ

ANTI-FROST HEATER

CHAUFFAGE ANTI-GIVRE

YG YG

２

１

FLAMEROD

DÉTECTEUR DE

FLAMMES

６５４３２１

４

３

２

１

DISPLAY

AFFICHAGE

１

２

３

４

５

１

２

３

GAS TYPE

CIRCUIT BOARD

PLAQUE DE CIRCUIT

IMPRIMÉ TYPE GAZ

１

２

３

４

５

６

７

８

９

１

２

３

４

５

６

７

８

９

１０

１１

Ｒ

Ｗ

Ｙ

Ｗ

ＢＫ

ＢＬ

ＢＫ

ＢＬ

WATER FLOW SENSOR

CAPTEUR DE DÉBIT D'EAU

HEAT EXCHANGER THERMISTOR

THERMISTANCE ÉCHANGEUR DE CHALEUR

HOT WATER OUTLET THERMISTOR

THERMISTANCE SORTIE D'EAU CHAUDE

OVER HEAT LIMITER

LIMITEUR DE SURCHAUFFE

AMBIENT AIR THERMISTOR

THERMISTANCE D'AIR AMBIANT

⑮

① ②

③ ④

⑤ ⑥

G／Y

Ａ

Ｂ

Ｃ

Ｄ

Ｅ

Ｆ

Ｇ

Ｍ

Ｎ

Ｋ

Ｏ

Ｉ

Ｈ

Ｌ

LIMITER

LIMITEUR

MOTOR

MOTEUR

WATER BY-PASS

CONTROL MOTOR

　　　　　　　MOTEUR MÉLANGE D'EAU

WATER VOLUME

CONTROL MOTOR

　　　　　　MOTEUR DÉBIT D'EAU

120V

G／YorG

GND

BK OR W

USUALLY

DISCONNECTED

NORMALEMENT

DÉCONNECTÉ

　　　　VERT／JAUNE

G／Y：GREEN／YELLOW，

　　O：ORANGE，ORANGE

COLOR CODE

　　R：RED，ROUGE

　　W：WHITE，BLANC

　BR：BROWN，MARRON

　BL：BLUE，BLEU

　BK：BLACK，NOIR

　GY：GRAY，GRIS

　　G：GREEN，VERT

　　Y：YELLOW，JAUNE

CODE COULEUR

　　P：PINK，ROSE

　PU：PURPLE，VIOLET

ＰＳＶ

ＳＶ４

ＳＶ０

ＳＶ１

ＳＶ２

ＳＶ３

＋

－

SOLENOID VALVE 4

ÉLECTROVALVE 4

SOLENOID VALVE 3

ÉLECTROVALVE　3

SOLENOID VALVE 2

ÉLECTROVALVE　2

SOLENOID VALVE 1

ÉLECTROVALVE　1

GAS INLET SOLENOID VALVE 0

ÉLECTROVALVE 0 D'ADMISSION DE GAZ

⑦ ⑧

⑨ ⑩

⑪ ⑫

⑬ ⑭

⑯

①

③

⑤

⑦

⑨

⑪

⑬

⑮

１

２

３

４

５

Ｇ

WIFI MODEL

MODÈLE WIFI

FOR NON-WIFI MODEL ONLY

UNIQUEMENT POUR MODÈLE

SANS WIFI

FOR WIFI MODEL ONLY

UNIQUEMENT POUR MODÈLE WIFI

ＦＭ

FAN MOTOR

VENTILATEUR DU MOTEUR

P.G.F.R VALVE

VALVE P.G.F.R

４１－３４３０１　１

WATER LEAK SENSOR

CAPTEUR DE FUITE D'EAU

MIN BUTTON

SW２

SW３

ADJUSTER BUTTON

BOUTON DE RÉGLAGE

MAX BUTTON

BOUTON MAX

BOUTON MIN

SW１

MARCHE

DIP SWITCH2

CONTACTEUR DIP2

OFF

ARRÊT

MARCHE

DIP　SWITC1

ARRÊT

CONTACTEUR　DIP1

OFF

１２

３

４

１

２

３

４

DIP１DIP２

SW１SW２

SW３

LED

WATER LEVEL ELECTRODE

ÉLECTRODE DE NIVEAU D’EAU

FOR CONDENSING MODEL ONLY

FOR INDOOR,DIRECT-VENT

MODEL ONLY

POUR MODÈLE INTÉRIEUR À

VENT DIRECT SEULEMENT

BATH REMOTE

CONTROL 1

BATH REMOTE

CONTROL ２

（USC1－117）

FUSE(10A)

FUSIBLE(10A)

１

２

３

４

WIRING DIAGRAM

（）

LIMITER

LIMITEUR

MOTOR

MOTEUR

G R BRBL W O Y BKG R BR

BLW O Y

UNIQUEMENT POUR MODÈLE DE CONDENSAGE

②

④

⑥

⑧

⑩

⑫

⑭

⑯

TÉLÉCOMMANDE 1

<<DE BAIN>>

TÉLÉCOMMANDE 2

<<DE BAIN>>

（USC2－117）

１

①

③ ④

②

③ ①

②④

ＧＮＤ

ＩＧ

IGNITER

ALLUMEUR

Ｗ

ANTI-FROST HEATER

CHAUFFAGE ANTI-GIVRE

YG YG

２

１

FLAMEROD

DÉTECTEUR DE

FLAMMES

６５４３２１

４

３

２

１

DISPLAY

AFFICHAGE

１

２

３

４

５

１

２

３

GAS TYPE

CIRCUIT BOARD

PLAQUE DE CIRCUIT

IMPRIMÉ TYPE GAZ

１

２

３

４

５

６

７

８

９

１

２

３

４

５

６

７

８

９

１０

１１

Ｒ

Ｗ

Ｙ

Ｗ

ＢＫ

ＢＬ

ＢＫ

ＢＬ

WATER FLOW SENSOR

CAPTEUR DE DÉBIT D'EAU

WATER INLET THERMISTOR

THERMISTANCE ENTREE D'EAU FROIDE

HEAT EXCHANGER THERMISTOR

THERMISTANCE ÉCHANGEUR DE CHALEUR

HOT WATER OUTLET THERMISTOR

THERMISTANCE SORTIE D'EAU CHAUDE

OVER HEAT LIMITER

LIMITEUR DE SURCHAUFFE

AMBIENT AIR THERMISTOR

THERMISTANCE D'AIR AMBIANT

⑮

① ②

③ ④

⑤ ⑥

G／Y

Ａ

Ｃ

Ｄ

Ｅ

Ｆ

Ｇ

Ｍ

Ｎ

Ｋ

Ｏ

Ｉ

Ｈ

Ｌ

LIMITER

LIMITEUR

MOTOR

MOTEUR

WATER BY-PASS

CONTROL MOTOR

　　　　　　　MOTEUR MÉLANGE D'EAU

WATER VOLUME

CONTROL MOTOR

　　　　　　MOTEUR DÉBIT D'EAU

G／YorG

GND

BK OR W

USUALLY

DISCONNECTED

NORMALEMENT

DÉCONNECTÉ

　　　　VERT／JAUNE

G／Y：GREEN／YELLOW，

　　O：ORANGE，ORANGE

COLOR CODE

　　R：RED，ROUGE

　　W：WHITE，

　BR：BROWN，MARRON

　BL：BLUE，BLEU

　BK：BLACK，NOIR

　GY：GRAY，GRIS

　　G：GREEN，VERT

　　Y：YELLOW，JAUNE

CODE COULEUR

　　P：PINK，ROSE

　PU：PURPLE，VIOLET

ＰＳＶ

ＳＶ４

ＳＶ０

ＳＶ１

ＳＶ２

ＳＶ３

＋

－

SOLENOID VALVE 4

ÉLECTROVALVE 4

SOLENOID VALVE 3

ÉLECTROVALVE　3

SOLENOID VALVE 2

ÉLECTROVALVE　2

SOLENOID VALVE 1

ÉLECTROVALVE　1

GAS INLET SOLENOID VALVE 0

ÉLECTROVALVE 0 D'ADMISSION DE GAZ

⑦ ⑧

⑨ ⑩

⑪ ⑫

⑬ ⑭

⑯

①

③

⑤

⑦

⑨

⑪

１

２

３

４

５

Ｗ

Ｇ

ＦＭ

FAN MOTOR

VENTILATEUR DU MOTEUR

FOR OUTDOOR MODEL ONLY

UNIQUEMENT POUR MODÈLE À USAGE EXTÉRIEUR

P.G.F.R VALVE

VALVE P.G.F.R

WATER LEAK SENSOR

CAPTEUR DE FUITE D'EAU

MIN BUTTON

SW２

SW３

ADJUSTER BUTTON

BOUTON DE RÉGLAGE

MAX BUTTON

BOUTON MAX

BOUTON MIN

SW１

MARCHE

DIP SWITCH2

CONTACTEUR DIP2

OFF

ARRÊT

MARCHE

DIP　SWITC1

ARRÊT

CONTACTEUR　DIP1

OFF

１２

３

４

１

２

３

４

DIP１DIP２

SW１SW２

SW３

LED

ÉLECTRODE DE NIVEAU D’EAU

FOR CONDENSING MODEL ONLY

BATH REMOTE

CONTROL 1

BATH REMOTE

CONTROL ２

（USC1－117）

１

２

３

４

TO PUMP

À LA POMPE

SCHÉMA DE CÂBLAGE

WIRING DIAGRAM

（）

LIMITER

LIMITEUR

MOTOR

MOTEUR

G R BRBL W O Y BKG R BR

BLW O Y

UNIQUEMENT POUR MODÈLE DE CONDENSAGE

②

④

⑥

⑧

⑩

⑫

⑭

⑯

TÉLÉCOMMANDE 1

<<DE BAIN>>

TÉLÉCOMMANDE 2

<<DE BAIN>>

（USC2－117）

BLBK

O Y

CIRCUIT BOARD

PLAQUE DE CIRCUIT

UNIQUEMENT POUR

MODÈLE DE CONDENSAGE

FOR CONDENSING MODEL ONLY

ＢＫ

THERMOSTAT

UNIQUEMENT POUR

MODÈLE DE CONDENSAGE

FOR CONDENSING MODEL ONLY

MAIN REMOTE

CONTROL

TÉLÉCOMMANDE

<<MAIN>>

（UMC-117）

５６

Electrical Wiring

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, flue outlet, 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.

Make sure the heater and remote control are

properly fastened to their mounting surfaces.

Make sure the heater and remote control are wired

in accordance with all regulations and codes without

any exposed connections.

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.

Electrical

Checklist

Condensate drain is properly routed to an

external neutralizer or corrosive resistant drain,

if applicable.

F. Condensate

Installation Checklist

Indoor water heaters must be installed indoors.

Outdoor water heaters must be installed

outdoors.

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 in the

"Vertical Vent Installation section.

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.

DIP Switches are properly adjusted per vent

length and elevation

Water supply has sufficient pressure.

Air has been purged from the water heater and

the piping.

Water connections tight and free from leaks.

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.

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).

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

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

USING YOUR WATER HEATER

Operating Instructions

Read, understand, and follow the safety information

listed on the operating label and in the “Important

Safety Information” section in this manual.

Disconnect all electric power to the water heater.

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 the front cover

of this manual.

Turn the gas shut-off valve counterclockwise to the

ON position.

Turn on all electric power to the water heater.

The remote control must be powered on prior to

operating the 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

Disconnect all electric power to the water heater.

Turn the gas shut-off valve clockwise to the OFF

position.

Activating the Water Heater

Use Instructions

USING YOUR WATER HEATER

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 front of the remote 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 remote control has been preset and shipped at the

recommended 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.

Use Instructions

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 display control temperature range is between

100°F (38°C) and 140°F (60°C). To adjust the

temperature to a desired setting, press the UP or

DOWN adjustment button on the face of the remote

control. The new temperature set point will show on

the LED display.

NOTICE:

The temperature set point by default cannot be increase

above 120°F (49°C).

To achieve temperatures above 120°F (49°C), refer page 56

in this Use & Care manual.

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 water heater.

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.

PRIORITY

In-Use Indicator

(Lit during operation)

Priority

Indicator

Power On/Off

Indicator

Temperature

Adjustment

Buttons

Temperature

Adjustment

Buttons

WiFi

Button

Priority

Indicator

Power On/Off

Indicator

In-Use Indicator

Lit during operation

Alarm/ Error

Indicator

WiFi Signal

Indicator

Power On/Off

Button

LED

Temperature

and Error Code

Display

LED Temperature

and Error Code

Display

Power On/Off

Button

(WiFi model only)

LED DISPLAY LED WiFi DISPLAY

USING YOUR WATER HEATER

Setting the Water Temperature

WARNING:

Improper adjustment, alteration, service, or maintenance

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

or product damage.

Maximum Temperature Adjustment

by the Main Display Control

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.

To adjust the set temperature above 120°F (49°C),

please refer the following steps.

Turn on the control.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the UP adjustment button repeatedly until

120°F (49°C) shows in the LED display.

NOTICE:

LED display only shows °F.

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

Start/Adjust

Temperature Conversion Chart °F/°C

°F 100 102 104 106 108 110 112

°C 38 39 40 41 42 43 44

°F 114 116 118 120 125 130 140

°C 46 47 48 49 52 54 60

In-Use Indicator

(Lit during operation)

Priority

Indicator

Temperature

Adjustment

Buttons

LED

Temperature

and Error Code

Display

Power On/Off

Button and

Indicator

USING YOUR WATER HEATER

WiFi Setup

1. Download the EcoNet app to your mobile device

and ensure that the device is connected to the

WiFi network.

2. Press and hold the WiFi button on the

display until the WiFi indicator begins

flashing .

3. Open the EcoNet application and follow the

instructions on the application to connect the

water heater.

PRIORITY

Start/Adjust

While "120" is shown on LED display, press and hold

UP button for 5 seconds. "140" is shown on the LED

display.

If need to disable the ability to set above 120°F,

please refer the following steps:

Press DOWN button until "100" appears.

Press and hold DOWN button for 2 seconds.

While holding the DOWN button, press the UP

button. Release both buttons.

USING YOUR WATER HEATER

Setting the Water Temperature

USING YOUR WATER HEATER

Recirculation Pump Control

Local codes or plumbing authority requirements may vary

from the instructions or diagrams provided in this manual

and take precedence over these instructions.

Recirculation Mode

Your tankless water heater has the ability to control

an external recirculation pump which recirculates the

water in the plumbing system to provide hot water

more quickly when a faucet is opened.

Two modes are available:

• Timer recirculation (Energy Saver Mode)

• Timer recirculation (Performance Mode)

If this water heater has wifi capability, additional two

modes are available:

• On-Demand recirculation

• Schedule recirculation

Information for setting up these modes can be found

in the EcoNet App.

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

76 of this use and care manual if you need more

information.

Recommend size and length for

recirc. line

To conserve energy and minimize heat loss,

insulation for hot water lines is recommended.

*Equivalent pipe length includes hot water line, return

lines and all fittings.

Recirculation Pump

Maximum allowable equivalent pipe Length*

Pipe Diameter

(Copper pipe)

¾” ½”

Pipe length 400 ft� 100 ft�

Recirculation Pump

(Copper

Pipe)

(Copper

Pipe)

Optional Shut-Off Valve

Circulation

Pump with

built in check

valve

Wire to Connect

Pump to heater

(8 ft long)

Cold Water

to Tankless

Check

Valve

Shut-Off

Valve

Cold Water

Supply

Expansion

Tank

Tankless

Water

Heater

Hot Water

to Fixtures

Hot Water

Loop

Dedicated

Return Line

USING YOUR WATER HEATER

Recirculation Pump Control

Typical Recirculation Pump Installation with Comfort Valve Kit

Comfort Valve Kit can be used for applications that

DO NOT have a dedicated return line. Comfort Valve

should be installed at the farthest fixture.

Refer to page 57 for maximum allowable equivalent

pipe length.

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.

USING YOUR WATER HEATER

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)

Power receptacle

should be close

to appliance

Tankless

water heater

power cord

Install Thermal Bypass

(Crossover) Valve at the

farthest fixture

To fixture

Fixtures

Cold water

line

(Copper

pipe)

(Copper

pipe)

Cold water

to tankless

water heater

Check

valve

Cold Water

Supply

Expansion

Tank

Shut-off

Valve

Shut-off

Valve

Service

Valves

Hot

Hot Hot

Cold

Cold Cold

Recirculation Pump

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.

Control

Board

PUMP

Add

4 Amp

Fuse

Blue

connector

Cut blue connector

and splice wires.

Ground

Recirculation Pump

Recirculation Pump Control

USING YOUR WATER HEATER

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 (8°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 reading.

Energy Saver mode

The Energy Saver mode operates as below:

• Less Energy consumption due to fewer pump

cycles

• Pump cycles ON Every 30 to 60 minutes

Performance mode

The Performance mode operates as below:

• Higher energy consumption due to more pump

cycles

• Pump cycles ON every 15 to 30 minutes

Mode Setting -Timer Mode-

The factory setting for the switch should all be in the

OFF position (Down).

Change the first switch on “DIP switch 2” to the ON

position (UP). Performance mode is selected.

To select Energy Saver mode, change the fourth

switch on “DIP switch 1” to the ON position (UP).

Replace the front cover panel.

Turn on all electric power to the water heater.

Setting Temp Typical Pump ON Intervals [Min]

[°F]

Performance Energy Saver

140 15 30

135 15 30

130 15 30

125 15 30

120 16 31

118 17 33

116 18 35

114 19 38

112 20 40

110 22 44

108 24 47

106 26 51

104 28 56

102 31 62

100 35 69

Actual pump ON intervals may vary based on the

setting temperature, insulation, and heat loss in the

system.

Recirculation Pump

Recirculation Pump Control

1 2 3 4

DIP 1DIP 2

1 2 3 4

DIP 1DIP 2

1 2 3 4

DIP

Switch

"MAX"

button

"ADJUST"

button

"MIN"

button

DIP

Switch

USING YOUR WATER HEATER

Recirculation Pump

Recirculation Operation –

On-Demand mode-

If the On-Demand mode is used, the water heater

needs wifi capability.

If the water heater is NOT a WiFi model, you cannot

use the On-Demand mode.

To enter On Demand Mode

• Ensure Switch 1 on DIP 2 and switch 4 on DIP 1

are off.

• In less than one minute.

• Turn Switch 1 on DIP 2 on-off-on-off.

• Press the Adjust Button

• The PCB LED will flash one time

The unit is now in on demand mode.

NOTE:

If the water heater does not have WiFi capability,

the built-in display needs to be replaced with the

display including WiFi capability.

Rheem offers the display including wifi capability.

See the Parts and Accessories catalog for more

information.

When set to On-Demand mode, the recirculation

pump is ON for 5 minutes when the water heater

receive the signal form the application on smart

phone.

Mode setting – On-Demand mode-

Please refer to EcoNet app for instructions.

Recirculation Operation – Schedule

mode-

If the Schedule mode is used, the water heater needs

wifi capability.

If the water heater is NOT a WiFi model, you cannot

use the Schedule mode.

NOTE:

If the water heater does not have WiFi capability,

the built-in display needs to be replaced with the

display including WiFi capability.

Rheem offers the display including WiFi capability.

See the Parts and Accessories catalog for more

information.

When set to Schedule mode, the recirculation

pump is ON according the setting schedule on the

application on smart phone

Mode setting – Timer mode-

To use Schedule mode, the water heater should be

set to Performance mode or Timer mode.

Recirculation Pump Control

USING YOUR WATER HEATER

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.

Remove the front cover panel on the water heater

and ensure the remote is OFF.

Find DIP Switch 1 located in the top-right portion at

the control board. The switch labeled “DIP 1” is the

right-most set of switches. If any DIP switches are

on for venting/altitude settings, switch them to the

OFF position.

Change the third switch on “DIP 1” to the ON

position (UP).

Within 30 seconds of turning the third switch ON,

press the "Max button" or "Min button" on the

control board to set the activation of this control.

LED display on the built-in control shows “oF”.

Within the next 30 seconds, the display/control

board will show the water saving control setting. The

LED identifications are below

1 2 3 4

DIP 1

DIP 2

Start/Adjust

DIP Switch

Control Board

1 2 3 4

DIP

Switch

"MAX"

button

"ADJUST"

button

"MIN"

button

DIP

Switch

USING YOUR WATER HEATER

WATER SAVING

CONTROL

CONTROL BOARD LED

(RED)

DISPLAY LED

ON Once Flashing ON

OFF Twice Flashing OF

Replace the front cover panel and turn the remote

ON. Turn the remote on before turning the water

supply on.

Turn on the gas and water to the water heater by

opening the shut-off valves.

Start/Adjust

USING YOUR WATER HEATER

Water Saving Control

1 2 3 4

After setting the activation of this control, change

the third switch on “DIP 1” to the OFF position

(DOWN). Be sure to reapply any venting/altitude DIP

switch settings.

Venting System (Direct Vent Only)

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.

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.

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 an external

neutralizer or proper drain that can handle

corrosive condensate. This could cause the system

to malfunction or fail.

On a regular basis, inspect the condensate drain line

to ensure the condensate is draining properly.

Water Heater Inspections

Care Instructions

Condensate Drain

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 4 screws and the unit cover panel.

Turn on a hot water faucet.

While the water heater is operating, inspect the main

burner flames through the burner sight glass. The

flames should be blue when the main burner is firing.

NOTICE:

If the flames are not blue or 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.

Care Instructions

Burner

Sight

Glass

CARING FOR YOUR WATER HEATER

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 with a damp soft cloth and

mild detergent. Gently wipe and completely dry all

surfaces.

Check the air intake and vent outlet 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 off the water heater and disconnect the

electrical power supply.

Turn off the water supply to the water heater.

Drain the water heater. See "Draining the Water

Heater" section.

Outdoor models

Care Instructions

Cold Water Supply

Shut-Off Valve

Drain

Valve

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.

Turn on the water supply, reconnect the electrical

supply, and turn on the water heater.

Care Instructions

CARING FOR YOUR WATER HEATER

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” on this Use and Care Manual.

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.

• 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 qualified service personnel to

verify proper operation.

• Check for abnormal sound during normal operation (e.g.,

hissing or banging noises). Contact 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.

• Visually inspect vent screens. Remove any debris or

blockages.

• If condensate neutralizer is installed; annually inspect

and ensure the neutralizer medium is present. If the

medium is depleted, replace the neutralizer.

• Check for blockage of condensate line.

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.

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.

Turn off the water heater by pressing the POWER

ON/OFF button on the LED display.

Close the gas shut-off valve(s).

At least 10 seconds after Step 1, unplug the water

heater or disconnect the power supply at the circuit

breaker box.

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 drain valve and the water filter located

at bottom of the water heater.

Using a suitable container to catch the water, remove

the water drain valve from the base of the hot water

outlet line, and the water filter from the base of the

cold water inlet line.

Connect a garden hose to the drain valve in 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.

Cold Water Supply

Shut-Off Valve

Water

Drain

Valve

Water Filter

Care Instructions

CARING FOR YOUR WATER HEATER

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 60 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 in the base of the cold water

inlet line, the water drain valve, 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.

Plug in the power cord or reconnect the power

supply at the circuit breaker box.

Open the gas shut-off valve(s).

Press the POWER ON/OFF button on the remote

control to restart the unit.

Draining the Water Heater

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.

Freeze Protection

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, precautions should be taken to

help prevent the water heater from freezing.

Freezing conditions come from the ventilation

system on direct-vent models and from exposure to

cold air on outdoor models.

All of these water heaters are equipped with a freeze

protection electric heater. This heater helps prevent

freezing inside the water heater down to an outside

temperature of -30°F (-35°C) on indoor installations

and approximately -4°F (-20°F) on outdoor

installations. These temperatures are all based on

temperatures without wind.

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 help protect the water heater, piping, and

valves from freezing.

If power outages occur during freezing conditions,

it is recommended to completely drain the water

heater to help prevent damage to the unit. See

"Draining the Water Heater." Once power is restored,

refill the water heater and check for frozen or leaking

components.

Components or heat exchangers damaged

by freezing conditions is not covered under

manufacturer's warranty.

Running Water Freeze Protection

Turn off the water heater by pressing the POWER

ON/OFF button on the remote control.

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.

Care Instructions

Cold Water

Service Valve

Drain

Water Outlet

Hot Water

Service Valve

Pressure

Relief

Valve

Water

Inlet

CARING FOR YOUR WATER HEATER

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.

When drained, some water may remain in the unit.

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, remote control, burners, vent connectors, or

other safety devices. Refer repairs to a qualified service

technician.

Problem Possible Cause Solution

Not enough or no hot water.

1. Unit is not ON. 1. Turn on the unit by pressing the

POWER ON/OFF button.

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 incoming

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 remote

control.

8. See “Service Error Code Chart” on

page 76. 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 76.)

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

2 4

CARING FOR YOUR WATER HEATER

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

Care Instructions

CARING FOR YOUR WATER HEATER

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 LED

display on the remote control. 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, remote control, burners, vent connectors, or

other safety devices. Refer repairs to a qualified service

technician.

When an error code is displayed:

Turn off all the hot water faucets.

Turn off the water heater by pressing the POWER

ON/OFF button on the remote control.

Wait about 5 minutes; then restart the water heater

by pressing the POWER ON/OFF button.

Turn on a hot water faucet and recheck the remote

control display.

If the error code remains in the display:

1. Turn off the hot water faucet.

2. Turn off the water heater.

3. Unplug the water heater from power, wait about

30 seconds and plug back in.

4. Follow the error code chart information.

5. Restart the water heater, turn on a hot water

faucet, and recheck the remote control display.

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.

Error Code Possible Cause Solution

Water heater has buildup of lime deposits. Contact a dealer or qualiﬁed service techni-

cian.

The gas shut-off valve is not fully opened. Check shut-off valve and open completely.

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.

Water heater is overheating. Contact a dealer or qualiﬁed service techni-

cian.

Neutralizer is clogged. Contact a dealer or qualiﬁed service techni-

cian.

Faulty inlet thermistor. Contact a dealer or qualiﬁed service techni-

cian.

Faulty outlet thermistor. Contact a dealer or qualiﬁed service techni-

cian.

Faulty blower motor. Contact a dealer or qualiﬁed service techni-

cian.

Faulty bypass motor. Contact a dealer or qualiﬁed service techni-

cian.

Solenoid valve circuit failure. Contact a dealer or qualiﬁed service techni-

cian. Flushing procedure may need to be re-

peated for excessive lime and scale build-up.

Reminder of ﬂushing the heat exchanger and/

or replacing the water treatment ﬁlter.

Contact a dealer or qualiﬁed service techni-

cian.

90 or 99

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 techni-

cian.

Not enough water ﬂow to operate the unit. Increase the water ﬂow from the ﬁxtures.

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

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 8 or the

ratings plate on the side 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

Start/Adjust

Maintenance Notice

Maintenance notice is an optional control and is

inactive as default. Maintenance notice 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. Contact technical

service department listed on page 76 of this use

and care manual if you are not familiar with these

maintenance activities.

Turn off the remote control.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press and hold the “▲“and “▼”button until “1Y ” is

displayed on the built-in display.

Press the “▲“or “▼”button until “8A ” is displayed.

Press and hold the power button on the build-in

display for 1 second.

The current setting time is displayed on the display.

(Factory setting is “OFF”)

Press the “▲“or “▼”button to choose “50”, “75”,

“100” or “OF”.

Turn on the gas and water to the water heater by

opening the shut off valves.

When tankless water heater has a certain number

of hours of combustion, error code “88” is shown

on the display. It is highly recommended to perform

water heater maintenance activities such as flushing

the heat exchanger and/or replacing the water

treatment filter (if applicable).

Displayed Maintenance Notice Hour

50 500 hours

75 750 hours

100 1,000 hours

OF OFF

CARING FOR YOUR WATER HEATER

ERROR CODE 88 CLEARING

IMPORTANT

It is highly recommended to perform water heater maintenance activities such as flushing the heat exchanger and/or replacing

the water treatment filter (if applicable) before clearing this error code.

After these maintenance activities are completed, follow the steps below to clear error code "88".

Turn on the remote control.

Turn off the gas and water to the water heater by

closing the shut-off valves.

Press the DOWN adjustment button repeatedly until

the lowest setting temperature shows in the LED

display.

Press and hold the DOWN and UP adjustment

button for 5 to 10 seconds.

Turn on the gas and water to the water heater by

opening the shut off valves.

If error code "88" is still shown, repeat steps 1

through 5 above.

Maintenance Notice

CARING FOR YOUR WATER HEATER

Start/Adjust

PARTS REPLACEMENT

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.

Direct-Vent Gas Components

Parts

1 Front Cover Final Assembly

2 Front Cover Screw

3 Cabinet Bracket

4 Power Cord

5 Display / Controller

6 Condensate Drain

7 Blower Motor

8 HEX Thermistor

9 Hot Water Connection

10 Drain Valve

11 Hot Water Thermistor

12 Water Control Valve

13 Inlet Water Connection

14 Water Filter

15 Manifold/Gas Valve Kit

16 Manifold Screw

17 Gas Connection

18 Inlet Gas Screw

19 Control Board

20 Program Chip

21 Igniter / Flame Rod Kit

22 Igniter Module

116

LIMITED WARRANTY

For the RHEEM®, RUUD®, Richmond®, Paloma®, and EcoSmart® Residential Tankless Gas Water Heaters.

GENERAL

This Limited Warranty is only available to the original owner of the water heater at the original installation location. This Limited Warranty is not

transferable.

Rheem Sales Company, Inc. (Rheem) warrants this tankless gas water heater, and its component parts, to be free from defects in materials and

manufacture, under normal use and service, for the Applicable Warranty Period specified below. At its option, Rheem will repair or replace the defective

water heater, or defective component part(s), in accordance with the terms of this Limited Warranty, if it fails in normal use and service during the

Applicable Warranty Period. The replacement water heater must be manufactured by Rheem under one of the covered brand names. The replacement

component part(s) must be Rheem authorized component part(s). The replacement unit will be warranted only for the unexpired portion of the original

unit’s Applicable Warranty Period.

Rheem strongly recommends that this tankless water heater be installed by a contractor that is licensed, state qualified and trained on Rheem's tankless

products because improper installation may invalidate warranty coverage.

EFFECTIVE DATE

The Effective Date of warranty coverage (or the beginning of the Applicable Warranty Periods) is the date of the original installation of the water heater, if

properly documented. Otherwise, it is the date of manufacture of the water heater plus ninety (90) days.

APPLICABLE WARRANTY PERIODS: The Applicable Warranty Period depends on the type of installation, as described below:

Residential: a Single Family Dwelling

Twelve (12) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the

Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST.

Residential: a Single Family Dwelling used with Hydronic Force Air Heating

Ten (10) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the

Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that a Rheem manufactured/

Rheem approved potable water hydronic air handler is installed with the system.

Residential: a Single Family Dwelling with recirculation, controlled loop

Twelve (12) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the

Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that the recirculation system is

an on demand type system or the pump is controlled with a temperature sensor (aquastat) and timer.

Residential: a Single Family Dwelling with recirculation, uncontrolled loop

Three (3) years from the Effective Date for the heat exchanger, three (3) years from the Effective Date for the component parts, and one (1) year from

the Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST, if the water heater is installed in a

system in which the water is re-circulated using a continuously operating pump.

Commercial: any installation that is not a single family dwelling

Five (5) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the

Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST.

Commercial: with recirculation, controlled loop

Five (5) years from the Effective Date for the heat exchanger, five (5) years from the Effective Date for the component parts, and one (1) year from the

Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST. Provided that the recirculation system is

an on demand type system or the pump is controlled with a temperature sensor (aquastat) and timer.

Commercial: with recirculation, uncontrolled loop

Three (3) years from the Effective Date for the heat exchanger, three (3) years from the Effective Date for the component parts, and one (1) year from

the Effective Date for certain labor as described under the heading, LABOR, SHIPPING AND PROCESSING COST, if the water heater is installed in a

system in which the water is re-circulated using a continuously operating pump.

WARRANTY EXCLUSIONS

This Limited Warranty will not cover:

a) Damages, malfunctions or failures resulting from:

1. Installation of the water heater in environments in which water quality levels DO NOT fall within the ranges listed in the table below:

b) Operating the water heater in a corrosive or contaminated atmosphere, including without limitation damages, malfunctions or failures caused by lime, mineral build-up, or scale.

c) Service trips to your business to teach you how to install, use, or maintain this water heater or to bring the water heater installation into compliance with local building codes and

regulations or manufacturer’s installation requirements.

d) Water heater unit installed for use in: spa or pool heating; a recreational vehicle; a boat or any other watercraft.

e) Water heater unit installed in any circulating system in which the temperature of the incoming water to the water heater is in excess of 140° f.

f) Water heater unit that is installed in any installation supplying radiant heat, such as in floor, baseboard, radiators, snow melt or closed loop systems, or any system using glycol or non-

potable water.

g) Damages, malfunctions or failures resulting from failure to install the water heater in accordance with applicable building codes/ordinances or good plumbing and electrical trade practices.

h) Damages, malfunctions or failures resulting from improper installation or failure to operate and maintain the unit in accordance with the manufacturer’s instructions.

i) Performance problems caused by improper sizing of the water heater or the gas supply line, the venting connection, combustion air openings, electric service voltage, wiring, or fusing.

j) Damages, malfunctions or failures caused by improper conversion from natural gas to LP gas or LP gas to natural gas fuel source.

k) Damages, malfunctions or failures caused by operating the water heater with any parts removed or with modified, altered, or unapproved parts installed.

l) Damages, malfunctions or failures caused by abuse, accident, fire, flood, freeze, lightning, acts of God and the like.

m) Heat exchanger failures (leaks) caused by operating the water heater in a corrosive or contaminated atmosphere or damages, malfunctions or failures caused by lime, mineral build-up, or

scale.

n) Damages, malfunctions or failures caused by operating the unit at water temperatures exceeding the maximum setting of the operating, or high limit, control.

o) Heat exchanger failures caused by operating the water heater when it is not supplied with potable water, free to circulate at all times.

p) Damages, malfunctions or failures caused by subjecting the heat exchanger to pressures, or firing rates, greater than those shown on the rating label.

q) Damages, malfunctions or failures resulting from the use of any attachment, including any energy saving device, not authorized by Rheem.

r) Units installed outside the fifty states (and the District of Columbia) of the United States of America and Canada.

s) Units removed from the original installation location and reinstalled elsewhere.

t) Units that have had their rating labels altered, tampered with, or removed. A water heater should not be operated if the rating label is removed.

Chart for Recommended Water Quality Levels

pH (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

Warranty

LABOR, SHIPPING, AND PROCESSING COSTS

For one (1) year after the Effective Date, Rheem will cover reasonable labor costs necessary to repair or replace a tankless water heater or component part that Rheem

determines to be defective and covered by this Limited Warranty. The warranty service must be performed by a contractor that is licensed, state qualified, and trained to

install and service Rheem's tankless water heaters. This Limited Warranty does not cover any labor expenses for general service, inspection, reinstallation, permits, removal

and disposal of the failed water heater or defective component part(s), or updating the installation to meet manufacture or local code requirements. All such expenses are your

responsibility.

Rheem will pay the transportation costs for an “in-warranty” replacement water heater, or “in-warranty” replacement component part(s), to a convenient delivery point (selected

by Rheem) near the place the original water heater, or original component part(s), is located: such as a local water heater distributor. You must pay any local freight charges,

including the cost of returning the failed water heater, or defective component part(s) to a convenient shipping location (selected by Rheem): such as a local Rheem distributor.

Rheem does not authorize, recommend, or receive any benefit from any claims processing or similar fees charged by others to process warranty claims for any water heater

or component part(s). Rheem will not reimburse any party for these, or any other, fees not specifically covered in this Limited Warranty document.

HOW TO OBTAIN WARRANTY CLAIM ASSISTANCE

Any claim for warranty assistance must be made promptly. First, determine if your water heater is “in-warranty” (that is, within the Applicable Warranty Period). You can

determine your unit’s warranty status by adding its Applicable Warranty Period to its date of installation. However, if you DO NOT have documentary proof of your water

heater’s date of installation, your unit’s warranty status will be based on its date of manufacture as determined from the serial number. Add the Applicable Warranty Period

plus ninety (90) days to the date of manufacture to determine whether the water heater is still covered by this Limited Warranty. You may also determine your unit’s warranty

status by obtaining the complete model number, complete serial number, and date of installation of your water heater and then accessing the “Warranty Verification”

information on Rheem Water Heaters' internet website (www.rheem.com) or contacting Rheem's Claims Department (telephone (800) 621-5622) during normal business

hours (in the Central Time Zone) to determine if the Applicable Warranty Period has expired.

If your water heater is “in-warranty”, contact the plumber, or mechanical contractor, that installed it for assistance with the warranty repairs, or replacement, required. Rheem

Water Heaters' Technical Service personnel are available to assist you (by telephone at (866) 720-2076) in obtaining “in-warranty” service or to answer your questions about

the operation or repair of your water heater during normal business hours (in the Central Time Zone). Be prepared to provide the plumber, mechanical contractor, or Rheem

Technical Service person you call with the complete model number, the complete serial number, and the date of installation of your water heater in addition to an explanation

of your water heater problem.

If an exact replacement is not available, Rheem will provide you with the current model of your water heater, or component part(s), or a replacement unit with comparable

operating features. If government regulations or industry certification or similar standards require the replacement water heater, or replacement component part(s), to have

features not found in the defective water heater, or the defective component part(s), you will be charged for the difference in price represented by those required features. If

you pay the price difference for those required features and/or to upgrade the size and/or other features available on a replacement new water heater, you will also receive a

complete new Limited Warranty (with the full Applicable Warranty Period) for the replacement new water heater.

Rheem reserves the right to inspect, or require the return of, the failed water heater or the defective component part(s). Each “in-warranty” failure water heater must be made

available to Rheem (with the rating label and all the component parts intact) in exchange for the replacement water heater. Each defective “in-warranty” component part to be

replaced must be returned to Rheem in exchange for the replacement component part.

Warranty compensation is subject to validation of “in-warranty” coverage by Rheem Claims Department personnel.

• To obtain warranty compensation for an “in-warranty” water heater failure, you must provide Rheem with the failed water heater (with the rating label and all the component

parts intact) the complete model number and the complete serial number of the Rheem or Ruud water heater that replaced the failed unit; and the date the original water

heater failed. You may also be required to provide documentary proof of the failed water heaters date of installation to establish its “in-warranty” status.

• To receive warranty compensation for an “in-warranty” defective component part, you must provide Rheem with: the defective component part; the complete model

number and the complete serial number of the Rheem or Ruud water heater from which the defective component part was removed; and the date the defective component

part failed. You may also be required to provide documentary proof of the date of installation of the Rheem or Ruud water heater from which the defective part was removed –

or the date of purchase of the part (If it was purchased separately) – to establish the “in-warranty” status of the defective component part.

• If Rheem determines that the water heater or component part returned to Rheem is free of defects in material and manufacture and/or that it was damaged by improper

installation or other cause not covered by this Limited Warranty, the warranty claim for the product, component part and/or labor maybe denied.

Warranty claim documentation should be mailed promptly to Rheem Water Heaters, Claims Department, 800 Interstate Park Drive, Montgomery, Alabama 36109, or in

Canada, 125 Edgeware Rd. Unit 1, Brampton, ON, Canada L6Y 0P5

EXCLUSIVE WARRANTY – LIMITATION OF LIABILITY

THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED IN CONNECTION WITH THIS RHEEM®, RUUD®,

RICHMOND®, PALOMA® AND ECOSMART® RESIDENTIAL TANKLESS GAS WATER HEATER UNIT (THE “WATER HEATER”). No one

is authorized to make any other warranties on behalf of Rheem. ANY IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, OR FITNESS

FOR A PARTICULAR PURPOSE, SHALL NOT EXTEND BEYOND THE APPLICABLE WARRANTY PERIODS, SPECIFIED PREVIOUSLY.

RHEEM’S SOLE LIABILITY, WITH RESPECT TO ANY DEFECT, SHALL BE AS SET FORTH IN THIS LIMITED WARRANTY, AND ANY

CLAIMS FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGE FROM WATER LEAKAGE) ARE EXCLUDED. Some

states DO NOT allow limitations on how long an implied warranty lasts, or for the exclusion of incidental or consequential damages, so the above

limitations or exclusions may not apply to you.

This Limited Warranty gives you specific legal rights, and you may also have other rights, which vary from state to state.

DO NOT RETURN THIS WATER HEATER OR PART TO RHEEM WITHOUT A RETURN AUTHORIZATION.

This document is for reference only and does not replace the original warranty document found in the back of the Use and Care manual

provided with the tankless water heater.

DO NOT RETURN THIS DOCUMENT TO RHEEM.

KEEP IT WITH YOUR WATER HEATER OR BUSINESS RECORDS.

Name of Owner:

Owner’s Address:

Name of Plumber/

Mechanical Contractor – Installer:

Address of Plumber/

Mechanical Contractor – Installer :

Telephone Number of Plumber/

Mechanical Contractor – Installer:

Date of Water Heater Installation:

Model Number of Your Water Heater:

Serial Number of Your Water Heater:

Warranty

NOTES

Rheem ECOH160DVLN-3 Performance Platinum Super High Efficiency Indoor Outdoor Natural Gas Tankless Water Heater

Product's Documents

Use and Care Manual

Specifications

Rheem ECOH160DVLN-3 Questions and Answers