57
USING YOUR WATER HEATER
Recirculation Pump Control
Local codes or plumbing authority requirements may vary
from the instructions or diagrams provided in this manual
and take precedence over these instructions.
Recirculation Mode
Your tankless water heater has the ability to control
an external recirculation pump which recirculates the
water in the plumbing system to provide hot water
more quickly when a faucet is opened.
Two modes are available:
• Timer recirculation (Energy Saver Mode)
• Timer recirculation (Performance Mode)
If this water heater has wifi capability, additional two
modes are available:
• On-Demand recirculation
• Schedule recirculation
Information for setting up these modes can be found
in the EcoNet App.
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
76 of this use and care manual if you need more
information.
Recommend size and length for
recirc. line
To conserve energy and minimize heat loss,
insulation for hot water lines is recommended.
*Equivalent pipe length includes hot water line, return
lines and all fittings.
Recirculation Pump
Maximum allowable equivalent pipe Length*
Pipe Diameter
(Copper pipe)
¾” ½”
Pipe length 400 ft� 100 ft�
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