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items should be installed per the
manufacturer's instruc ons.
The installer will need to consider
the size of water tubing, material
type, and fi ngs when determining
the pressure drop of the system to
size the recircula on pump. Note
that these characteris cs vary for
each tubing material of the same
nominal size. Refer to the water
tubing manufacturer for pressure drop
informa on that is needed to size the
recircula on pump.
HOT WATER TO FIXTURES
TEMP. PROBE
BUILDING RETURN
Below is a suggested piping
diagram. Check with local codes and
ordinances for addi onal installa on
requirements. Refer to the water
heater manufacturer's website for
addi onal layouts.
Thermosta c mixing valves may be
used with tankless water heaters.
Consult with the mixing valve
manufacturer for the appropriate
mixing valve for the applica on. Refer
to the thermosta c mixing valve
manufacturer for proper installa on
when recircula on is in use.
GAS
PUMP
Figure 30 - Recircula on Loop Typical Confi gura on
SHUT OFF
VALVE
Residen al Gas Water Heater Use and Care Guide • 35
INSTALLATION
To reduce the risk of scalding,
install Thermosta c Mixing Valves
(temperature limi ng valves) at each
point of use.
EXPANSION
TANK
COLD
WATER
CHECK
SUPPLY
VALVE
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