Rheem 953060DP Owner's Manual And Installation Instructions page 9

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For continued safety of this water heater it must be installed, operated and
maintained in accordance with the Owner's Guide and Installation
Instructions.
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Servicing of a water heater must only be carried out by qualified personnel.
Phone Rheem Service or their nearest Accredited Service Agent / Centre.
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Only a person qualified to install or service a water heater can drain the
water heater, if this is required.
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Do not modify this water heater.
RELIEF VALVES
Temperature Pressure Relief Valve
The storage tank connected to this water heater incorporates a temperature
pressure relief valve located near the top of the storage tank. This valve is
essential for the water heater's safe operation.
It is possible for the valve to discharge a quantity of water through the drain line
during each heating period. This quantity should be equal to approximately 1/50
of the hot water used, as water expands by this volume when heated.
Expansion Control Valve
In many areas, including South Australia, Western Australia, New Zealand and
scaling water areas, it is mandatory an expansion control valve is fitted to the
cold water line to the water heater.
The expansion control valve will discharge the quantity of water from its drain
line during the heating period instead of the temperature pressure relief valve as
it has a lower pressure rating.
Valve Operation
Continuous leakage of water from either valve and its drain line may indicate a
problem with the water heater. Refer to "Minor Maintenance Every Six Months"
on page 20.
Warning: Never block the outlet of either valve or their drain lines for any
reason. A relief valve drain must be left open to atmosphere, and be installed in
a continuously downward direction.
In locations where water pipes are prone to freezing, the relief valve drain line
must be insulated and not exceed 300 mm in length before discharging into a
tundish through an air gap.
Operate the easing lever on the temperature pressure relief valve and expansion
control valve once every six (6) months to clear any deposits and ensure the
valve and its drain line are not blocked.
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