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15
RELIEF VALVE
A new pressure relief valve, complying with the Standard for relief Valves and Automatic Gas Shut-Off Devices
for Hot Water Supply Systems, ANSI Z21.22, must be installed at the hot water outlet connection of the water
heater at the time of installation. Local codes shall govern the installation of relief valves.
For safe operation of the water heater, be sure that:
• The pressure rating of the relief valve must not exceed 150 PSI, the maximum working pressure of the water
heater as marked on the rating plate.
• The BTU/Hr rating of the relief valve must equal or exceed the BTU/Hr input of the water heater as marked on
its rating plate.
• No valve of any type should be installed between the relief valve and the water heater.
• Discharge from the relief valve should be piped to a suitable drain to eliminate potential water damage.
Piping used should be of a type approved for the distribution of hot water.
• Hot and cold water lines should be insulated up to the water heater.
• The discharge line must be NO SMALLER than the outlet of the valve and must pitch downward to allow
complete drainage (by gravity) of the relief valve and discharge line.
• The end of the discharge line should not be threaded or concealed and should be protected from freezing.
No valve of any type, restriction or reducer coupling should be installed in discharge line.
NOTICE
The diagram below illustrates a pressure only relief valve. If local codes require a combination temperature and
pressure relief valve be installed, an extension piece may be needed.
Local codes govern the installation of relief valves. If local codes require that a temperature and pressure relief
valve should be installed the manufacturer recommends atype 40XL Watts T&P relief valve or an equivalent
model be used.
Manual operation of relief valves should be performed at least once a year. Turn off the electrical power
and gas shutoff valve. Lift and release lever on the relief valve and check the manual operation of the relief
valve.
You should take precaution to avoid contact with the hot water coming out of the relief valve and to prevent
water damage.
If the relief valve on the system discharges periodically, this may be due to thermal expansion in a closed water
supply system. Contact the water supplier or local plumbing inspector on how to correct this situation. Do not
plug the relief valve.
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