Supplemental instructions for gas water heaters installed in potable/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.
Safety Instructions
Hot water supply to
Combination Potable and Space Heating Application
house
Hot water supply to
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: 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
From HOT
unit
outlet on
requires water for space heating at |
water heater
Tee fitting for vertical hot water supply lines
Hot water |
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| From HOT | |||
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| outlet on | ||||
supply to |
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house |
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Hot water supply to heating unit
Tee fitting for horizontal hot water supply lines
elevated temperatures (above 125°F |
[52°C]), a mixing or tempering valve |
must be installed in the hot water |
supply line to the house in order to |
reduce the scald hazard potential. |
! 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. |
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. |
Typical Piping Diagram for Combination Potable/Space Heating Installation
Spring loaded check valve in |
heating unit hot water supply line |
Air vent
Domestic hot water supply
and cold water return line (not |
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supplied with water heater) |
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NOTICE: This check valve is |
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incorporated in some heating units. |
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Refer to the installation instructions |
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supplied with specific heating unit |
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to determine if it is required. |
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Isolation valve in hot water supply line | OT |
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| IL | ER |
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to heating unit | F E |
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| V L A | V | |
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(not supplied with water heater) |
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Mixing or tempering 
valve (refer 
to warning 
above)
COLD 
Incoming cold water supply
Heat trap 
6” Min.
Thermal expansion tank (if
Shut-off valve
Installation Instructions Operating Instructions Care and Cleaning
See diagrams above for proper pipe application for vertical or horizontal supply lines
Gas line to water heater
Temperature and pressure relief valve
Water heater jacket 
Temperature and pressure 
relief valve discharge line 
Isolation valve in cold water return line from heating unit (not supplied with water heater)
Cold water return line from heating unit
Hot water |
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supply line into |
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heating unit |
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Drain valve |
| Heating unit |
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(not supplied |
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with water heater) |
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Troubleshooting Tips Customer Service
Combustion Air Inlet Openings | 15 |
6” air gap |