15
6) If the incoming water line to the heater is
equipped with a check valve, water meter or
pressure-reducing valve, an expansion tank
must be installed in the system. This will prevent
weeping from the water heater relief valve and pre-
mature failure of the heater due to expansion of the
water during the heating cycle.
7) Before acquisition of a water heater for space
heating application, it is necessary to have
the area of intended use sized by a qualified
technician. This will ensure that an adequate water
heating capacity will be available for both heating
and potable water supply and that the application
will meet all local codes and public utility require-
ments.
Note: It is good practice to oversize the water heater,
to ensure that all of the potential hot water require-
ments are available.
Check Valve
Inlet from
the space heating
circuit
Outlet to the
space heating
circuit
Circulation Pump
Cold water supply
to water heater
Hot water
to house
Air handler
Water heater
Figure 15
INSTALLATION INSTRUCTIONS
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