Important:Onlya newtemperature andpressure r elief
valveshould beused withyourwaterheater. D onotuse
anoldor existing valveasit maybedamaged or not
adequate f ortheworking pressure ofthenewwater
heater. D onotplace anyvalvebetween thereliefvalve
The Temperature & Pressure Relief Valve:
Must not be in contact with any electrical part.
Must be connected to an adequate discharge line.
Must not be rated higher than the working pressure
shown on the data plate of the water heater.
Must not be smaller than the pipe size of the relief
valve or have any reducing coupling installed in
the discharge line.
Must not be capped, blocked, plugged or contain
any valve between the relief valve and the end of
the discharge line.
Must terminate a maximum of 6 inches above a
floor drain or external to the building.
Must be capable of withstanding 250°F (121 °C)
Must be installed to allow complete drainage of
both the valve and discharge line.
If this water heater is used as a solar storage heater or
as a backup for the solar system, the water supply
temperatures to the water heater tank may be in excess
of 120°F. A tempering valve or other temperature limiting
valve must be installed in the water supply line to limit
the supply temperature to 120°F.
Solar water heating systems can often supply
water with temperatures exceeding 180°F and may result
in water heater malfunction.
Water Heater Location
Centrally located with the water piping system.
Located indoors and in a vertical position. Protected
from freezing temperatures.
Provisions made to protect the area from water
damage. Drain pan installed and piped to an
Sufficient room to service the water heater.
Temperature and pressure relief valve properly
installed with a discharge line run to an open drain
and protected from freezing.
All piping properly installed and free of leaks.
Heater completely filled with water. (See Figure 2)
Closed system pressure buildup precautions
Tempering valve installed per manufacturer's
Wiring and connections comply with all applicable
Water heater and electrical supply are properly
Proper overload fuse or circuit breaker protection