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R
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COLD
HOT
16
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 precedence over these instructions. Refer to Local Codes, Plumbing Authority and
Use and Care Manual supplied with water heater before starting any installation work.
Tee fitting for vertical hot
water supply lines.
Combination Potable 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.
WARNING: When this system
requires water for space heating
at elevated temperatures (above
125°F), 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.
WARNING: 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.
WARNING: If this water heater is
installed in an application intended
to supply domestic hot water needs
and hot water for space heating
purposes, DO NOT connect the
heater to an existing heating unit or
components of a heating system
that have previously been used with
a nondrinking water system. Toxic
chemicals such as those used for
boiler treatment may be present
and will contaminate the drinking
water supply causing possible
health risks. Never introduce toxic
chemicals, such as those used for
boiler treatment, into this system.
Tee fitting for horizontal hot
water supply lines.
Hot water
supply to
house
From HOT
outlet on
water heater
From HOT
outlet on
water heater
Hot water
supply to
heating
unit
Hot water
supply to
house
Hot water supply
to heating unit
Typical 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 valve is incorporated in
some heating units. Refer to the
installation instructions supplied
with specific heating unit to
determine if it is required.
See diagrams above for proper
pipe application for vertical
or horizontal supply lines
Gas line to water heater
Cold water return line
from heating unit
Hot water
supply line into
heating unit
Heating unit
Isolation valve in
cold water return
line from heating
unit (not supplied
with water heater)
Mixing or tempering
valve (refer to
warning above)
Gas water heater
Temperature and
pressure relief valve
discharge line
Drain valve
(not supplied
with water
heater)
Isolation valve in hot water
supply line to heating unit
(not supplied with water heater)
Incoming cold water supply
Domestic hot water supply
Air vent
Customer Service Troubleshooting Tips Care and Cleaning Operating Instructions Installation Instructions Safety Instructions
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