Instructions / Assembly

65
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.
Remote
Control
Tankless
Water Heater
Single Unit
Hot Water
to Fixtures
Hot Water
Loop
Dedicated
Return Line
Circulation
Pump with built
in check valve
Expansion
Tank
Wire to Connect
Pump to heater
(8 ft long)
Cold water
to Tankless
Cold Water
Supply
(Copper Pipe)
Check
Valve
Shut off
Valve
(Copper Pipe)
Optional Shut
off valve
Typical Recirculating Pump Installation
3
Recirculating Pump