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Thread: continuous "relief" from t&p valve

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  1. #1
    DIY Junior Member
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    Default continuous "relief" from t&p valve

    I have a 50 NG American W/H in house when we bought it and approx 5 yrs old. After 4+ yrs of no problems, my T/P valve started continously "relieving" itself on my basement garage floor. I have replaced the Thermostat unit (warranty), flushed the unit and adjusted the temp setting and incoming water flow, all trying to prevent stacking. Would replacing the T/P valve be a prudent step or should I just get a new heater.

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    Master Plumber Redwood's Avatar
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    I only fix things that are broken.

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    Forum Admin, Expert Plumber Terry's Avatar
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    If the T&P is letting water out,

    you may have a bad or worn T&P
    Or perhaps there is an expansion problem.

    If the system is "closed", then an expansion tank is needed.

    A system can be closed by a check valve (some new water meters have checks built in), a back flow preventer, or by a pressure reducing valve.

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    I can only assume the system is closed. I am going to try replacing the t&p valve and also will install an expansion tank. Hopefully this will solve my problem of continuous water from my relief valve. Thank You for you help.

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    Plumber Cass's Avatar
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    Do you know how to correctly install an expansion tank...

  6. #6

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    Quote Originally Posted by srichey01 View Post
    I can only assume the system is closed. I am going to try replacing the t&p valve and also will install an expansion tank. Hopefully this will solve my problem of continuous water from my relief valve. Thank You for you help.

    Yes you should buy a new T&P valve and change it, but skip the expansion tank for the moment. Buy a water pressure test gauge so you can measure water pressure. The cost is under $30 for both.

    I had to change my T&P valve last Thansgiving!

  7. #7

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    My water heater also recently started leaking thru the T&P valve. I changed it out and still the leak. Not thinking that the extra heating zone I added in the in the basement over the summer would cause an expansion problem (I had only one expansion tank for my closed system hot water boiler) I was scratching my head. I posted the problem here, then the light went on when someone mentioned an extra expansion tank.I added a small therm x trol in the cold water supply before the heater and well its been a few days ( knock on wood) and problem seems solved- no more dripping TPR valve. Hope this helps.

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