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25
Tee fitting for vertical hot
water supply lines.
Hot water
supply to
house
From HOT
outlet on
water heater
Hot water
supply to
heating
unit
Supplemental instructions for gas water heaters installed in
potable water/space heating applications
Local codes or plumbing authority requirements may vary from the instructions or diagrams provided in this
manual and take precedent over these instructions.
Tee fitting for horizontal hot
water supply lines.
From HOT
outlet on
water heater
Hot water
supply to
house
Hot water supply
to heating unit
Combination Potable Water and Space Heating Application
Tee fitting must be installed as shown. This
ensures that any air in the water lines will be
purged through the domestic water faucets and
showers.
DANGER: When this system requires
water for space heating at elevated
temperatures (above 125°F [52°C.]), a mixing
valve complying with the Standard for
Temperature Actuated Mixing Valves for Hot
Water Distribution Systems, ASSE 1017 must
be installed in the hot water supply line to the
house in order to reduce the scald hazard
potential.
DANGER: Any piping or components used
in the installation of this water heater in a
combination potable and space heating
application must be suitable for use with
drinking water.
NOTICE: Suitable for (potable) water
heating and space heating applications. DO
NOT use for space heating application only.
DANGER: If this water heater is installed
in an application intended to supply domestic
hot water needs and hot water for space
heating purposes, DO NOT connect the
heater to an existing heating unit or
components of a heating system that have
previously been used with a non drinking
water system. Toxic chemicals such as those
used for boiler treatment may be present and
will contaminate the drinking water supply
causing possible health risks. Never
introduce toxic chemicals, such as those used
for boiler treatment, into this system.
50 ft. maximum distance from water
heater to fan coil (developed length) is
required for Massachusetts State.
Typical 75 Gallon Piping Diagram for Combination Potable/Space Heating Installation
Spring loaded check valve in heating unit
hot water supply line and cold water return
line (not supplied with water heater)
NOTE: This check valve is incorporated
in some heating units. Refer to the
installation instructions supplied with
specific heating unit to determine if it is
required.
All water piping shall be insulated in
accordance with Local and State Energy
Code.
Isolation valve in
cold water return line
from heating unit (not
supplied with water
heater)
Nominal 3/4" size mixing or tempering valve
(refer to warning above). Follow mixing or
tempering valve manufacturer’s instructions for
installation of the valve.
Temperature and pressure relief
valve discharge line
Air Handler
Drain valve
(not supplied with
water heater)
Hot water
to space heater
Temperature and Pressure Relief
Valve, tie to location approved by
local code
See diagrams above for proper
pipe application for vertical
or horizontal supply lines.
Isolation valve in hot water supply line
to heating unit (not supplied with water
heater)
3/4" cold water supply
3/4" Tempered
domestic hot water
supply to house.
Gas line to water heater
6” Air Gap
Combustion Air Inlet
Openings
2 Gallon Thermal
Expansion Tank (if
required-not supplied
with water heater)
Air vent
Heat Trap
6” Min.
3/4" Shut-Off Valve (Typ.)
3/4" Check Valve with 1/8" Hole
Pressure Gauge
3/4" Shut-Off Valve (Typ.)
3/4" Shut-
Off Valve
(Typ.)
Hot water coil
All bronze pump.
Check valve
internal in pump.
Air bleed valve.
Water Sample Tap.
T
FAN
ON
OFF
HEAT
COOL
To HVAC Unit.
Electronically controlled pump timer.
Activates every 6 hours for 60 seconds.
Wire to bronze pump.
3/4" HWS & HWR
to Heating Coil.
Minimum of 2' developed
length of 3/4" pipe.
Water Heater drain pan installed
in accordance with the Local and
State Code
Water Heater to be in accordance
with the Local and State Energy
Code
Gas Fired
Water Heater
Gas Direct Vent discharge
must comply with Local
and State Codes
Vacuum Relief Valve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
Gas Control (Thermostat)
140°F
(60°C)
120°F to 130°F
(49°C to 54°C)
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