Rheem Tankless Water Heater User Manual

Below are instructions for draining water out
of the water heater.

Turn off the switch on the remote control.

Close the gas shut-off valve(s).

Unplug the power supply cord (or
disconnect breaker) at least 10 seconds
after step #1.

Open all hot water faucets. Before
proceeding to the next step, make sure that
COLD water is coming out of all hot water
faucets.

Close the water shut-off valve.

Using a suitable container to catch water,
remove the water filter from heater. Attach
a garden hose to the drain valve installed in
the hot water outlet line and direct the

stream of water to a suitable drain where it
will cause no damage. Leave water heater
as is until next use.

To put the water heater back into operation
after draining, follow the steps below.

Reinstall the drain plug and water filter.
Close the hot water outlet drain valve.

Open the water shut-off valve and close
again after making sure that water comes
out from hot water faucets. (This step is to
remove air from the water lines.)

Plug into an electrical outlet, fully open 
the gas shut-off valve and the water 
shut-off valve.

NOTICE: The water heater may not 
operate unless the above procedure is
followed correctly.