Rheem XWELL XC-10 Owner's Manual And Installation Instructions page 9

MAJOR SERVICE EVERY FOUR YEARS
It is mandatory a major service be conducted on the water heater every four (4) years.
The pressure relief valve should be replaced at intervals not exceeding four (4) years.
The checking of the valve performance or replacement should occur more frequently
in areas where there is a high incidence of water deposits.
Warning: Servicing of a water heater must only be carried out by qualified
personnel. Phone Rheem Service or the nearest authorised Service Agent.
Note: The major service and routine replacement of any components, such as the
anode and pressure relief valve, are not included in the Rheem warranty. A charge
will be made for this work. Only genuine replacement parts should be used on this
water heater.
The major service includes the following actions:
Replace the pressure relief valve at regular intervals, such intervals not exceeding

four (4) years.
 Inspect and if there is any sign of depletion, replace the anode.
If the anode is not replaced, it must be replaced within four (4) years of this
service.
 Check the electric heating unit for excessive calcium build-up or corrosion and
replace if necessary.
Visually check the unit for any potential problems.

Inspect all connections.

Note: The water heater may need to be drained during this service. After the
completion of the service, the water heater will take some time to reheat the water.
MAINTENANCE REQUIREMENTS
9