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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 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.
DANGER: When this system
requires water for space heating at
elevated temperatures (above 125°F
[52°C]), a mixing or tempering valve
must be installed in the hot water
supply line to the house in order to
reduce the scald hazard potential.
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.
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.
!
!
!
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
R
E
L
I
E
F
V
A
L
V
E
COLD
HOT
COLD
HOT
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)
NOTICE: 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.
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)
Water heater jacket
Temperature and pressure
relief valve discharge line
Drain valve
(not supplied
with water heater)
6” air gap
Isolation valve in hot water supply line
to heating unit
(not supplied with water heater)
Incoming cold water supply
Heat trap
6” Min.
Domestic hot water supply
Shut-off valve
Air vent
Temperature and pressure
relief valve
Combustion Air Inlet Openings
Supplemental instructions for gas water heaters
installed in potable/space heating applications.
Mixing or
tempering
valve (refer
to warning
above)
Thermal expansion tank
(if required-not supplied
with water heater)
21
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