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Temperature and Pressure
Relief Valve
For protection against excessive pressures and
temperatures, a temperature and pressure relief valve
must be installed in the opening marked “T & P RELIEF
VALVE” (see Figure 15). This valve must be design
certified by a nationally recognized testing laboratory
that maintains periodic inspection of the production of
listed equipment or materials as meeting the
requirements for Relief Valves and Automatic Shut-off
Devices for Hot Water Supply Systems, ANSI Z21.22.
The function of the temperature and pressure relief
valve is to discharge water in large quantities in the
event of excessive temperature or pressure developing
in the water heater. The valve's relief pressure must not
exceed the working pressure of the water heater as
stated on the data plate.
Optional location
some models only
Temperature and
Pressure Relief Valve
Discharge line 3/4” min.
Do not cap or plug.
6” max.
Drain Pan
Drain
Figure 15
Temperature and Pressure
Relief Valve Installation
Important: Only a new temperature and pressure relief
valve should be used with your water heater. Do not
use an old or existing valve as it may be damaged or
not adequate for the working pressure of the new water
heater. Do not place any valve between the relief valve
and the tank.
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.
The Discharge Line:
!
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 six inches above a
floor drain or external to the building.
!
Must be capable of withstanding 250°F (121°C)
without distortion.
!
Must be installed to allow complete drainage of
both the valve and discharge line.
Explosion Hazard
If the temperature and pressure relief
valve is dripping or leaking, have a
qualified service technician replace it.
• Do not plug valve.
• Do not remove valve.
Failure to follow these instructions can
result in death or explosion.
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