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AP18733 REV. 3.2.17
47
1. Only POTABLE water may be plumbed through the water heater.
2. The water heater cannot be used for space heating applications.
3. Expansion tank is required if a backow preventer is installed.
4. Isolation valve kits are recommended for this installation.
Figure 25 – Standard Mode Piping, Single Water Heater
Standard Mode
Air & Gas
Mixing
Recirculation
Pump
Hot Water Oulet
Condensate Hose
Burner
Secondary heat
exchanger
Primary heat
exchanger
Cold Water Inlet
Gas
Pressure Relief Valve
Expansion Tank (Install
according to local code)
Backow Preventer
(optional)
NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required
by local codes.
When using external recirculation mode with the
built-in pump, check the following maximum recir-
culation pipe lengths including fittings (3/4" pipe is
recommended):
-1/2" Pipe- 200' (60m) of equivalent length
-3/4" Pipe- 500' (150m) of equivalent length Lengths
in excess of these limits will require an external
recirculation pump.
External Recirculation mode
The recirculation pipe must be installed in the eld in
order to use ‘External Recirculation Mode’.
This mode allows the water heater to recirculate
heated water through the system and additionally
serves as a freeze protection function.
Figure 26 – Piping with External Recirculation Mode
Expansion Tank (Install
according to local code)
Recirculation
Pump
Pressure Relief Valve
Hot Water Oulet
Condensate Hose
Cold Water Inlet
Gas
Air & Gas
Mixing
Primary heat
exchanger
Burner
Secondary heat
exchanger
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