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    careypn's Avatar
    careypn Posts: 1, Reputation: 1
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    #1

    May 5, 2011, 02:44 AM
    Heater popoff valve
    What causes a waterheater popoff valve to leak I've replaced 4 this year
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
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    #2

    May 5, 2011, 03:42 AM

    Are you talking about The T&P Valve see the image below?

    If that is what you mean then you need to find the cause why it pops.

    In normal operation of the T&P valve, no water should be discharged from the valve.

    A T&P valve that discharges is an indication of an abnormal condition.The causes of discharge can be thermal expansion, excess system pressure, low temperature relief (T&P) failure, too high temperature setting, or something in the water heater causing excess temperatures.

    You need to check the water Temperature and the water pressure, and let us know, Thanks.

    John
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    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    May 5, 2011, 06:10 AM
    If this has happened with the frequency you say, check the water pressure at your HW heater with a Watts test gauge. It should not exceed 75#. There was a post last week with a same question and he found 125#. If your water line is equipped with a backflow checkvalve and you do not have an expansion tank, you may also be overpressuring the system that way or you may have a bad main pressure control valve.
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