Rheem XWELL XC-10 Owner's Manual And Installation Instructions page 11

PRESSURE RELIEF VALVE RUNNING
Normal Operation

It is normal and desirable the pressure
relief valve allows a quantity of water to
escape during the heating cycle, if a non-
return valve is installed on the cold water
line to the water heater.
This quantity
approximately 1/50 of the hot water used,
as water expands by this volume when
heated.
However, if it discharges more than a
bucket full of water in 24 hours, there may
be another problem.
Continuous dribble

Try gently raising the easing lever on the pressure relief valve for a few seconds
(refer to "Pressure Relief Valve" under User Maintenance Every Six Months on
page 8.). This may dislodge a small particle of foreign matter and clear the fault.
Release the lever gently.
Steady flows for long period (often at night)

This may indicate the mains water pressure sometimes rises above the designed
pressure of the water heater. Ask a plumber to fit a pressure limiting valve.
Warning: Never replace the pressure relief valve with one of a higher
pressure rating.
 Continuous flow of very hot water or steam from the pressure relief valve
drain
The water heater must be switched off at the switchboard or isolating switch.
Phone Rheem Service or the nearest authorised Service Agent to arrange for an
inspection.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU
NEED ASSISTANCE,
AUTHORISED SERVICE AGENT.
should be equal
PHONE RHEEM
to
SERVICE
11
SAVE A SERVICE CALL
drain
outlet
lift until water
flows from the
drain line –
lower gently
OR THE NEAREST