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If the temperature–pressure relief valve on the heater discharges
periodically or continuously, it may be due to thermal expansion of
water in a closed water supply system, or it may be due to a faulty
relief valve.
Thermal expansion is the normal response of water when it is
heated. In a closed system, thermal expansion will cause the
system pressure to build until the relief valve actuation pressure is
equaled. Then the relief valve will open, allowing some water to
escape, slightly lowering the pressure. Contact your water supplier
or local plumbing inspector on how to control this situation.
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND
PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION
AND CAN CREATE A HAZARDOUS SITUATION.
3. Anode Inspection and Replacement - This water heater is
equipped with multiple sacrificial anodes. Anodes protect the
glass-lined tank from corrosion by sacrificing themselves
through electrolysis. When the anode material is consumed,
there is no more protection and corrosion of the tank
accelerates.
Inspection of the anode every year allows you to identify a
spent anode and replace. Replace the anode when its
diameter is 3/8 of an inch, or every other year, which ever is
first. Aggressive, very hot and softened water causes rapid
consumption of the anode, requiring frequent inspections.
Anodes are available from your distributor or from the
manufacturer listed on the rating plate.
To inspect or replace an anode:
The anodes on this water heater are easily accessible from the
top of the heater making replacement simple and quick.
a. Turn the water heater electricity off for the zone
containing the Single-wall Indirect. Flow water until
the discharge is cool or allow enough time for the
potable water to cool naturally. Connect a hose to the
drain valve. Locate the hose’s
INTERNET VERSION FOR REFERENCE ONLY