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63
Remote
Control
Tankless
Water Heater
Single Unit
Hot Water
to Fixtures
Hot Water
Loop
Dedicated
Return Line
Circulation
Pump
Expansion
Tank
Wire to Connect
to Pump
Cold water
to Tankless
Cold Water
Supply
3/4”
3/4”
3
INSTALLATION INSTRUCTIONS
Recirculation Control
Local codes or plumbing authority requirements may vary
from the instructions or diagrams provided in this manual
and take precedence over these instructions�
Your tankless water heater has the ability to control an
external recirculation pump� Two modes are available,
Energy Saver and Performance, which recirculate the
water in the plumbing system to provide hot water more
quickly when a faucet is opened� Rheem offers a fully
packaged recirculation pump kit� See the Parts and
Accessories catalog for more information�
NOTICE:
Recirculation control is for residential application
only. Recirculation control cannot be used with
an air handler or with multiple water heater
installations. The maximum temperature setting is
140°F (60°C) in recirculation control.
Pump Requirements
Voltage: 120V, 60Hz
In-rush current: Less than 2�5 amps
Amperage: less than 2�0 amps
WARNING:
A control board can be damaged if amperage exceeds 2.0
amps.
Pump Size
The pump should be sized for about 2�5 gpm at the
pressure drop through the tankless water heater and the
supply and return plumbing in the recirculation loop�
Contact service department listed on page 26 of this use
and care manual if you need more information�
Typical Recirculating Pump Installation
Recirculating Pump
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