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    coondawg's Avatar
    coondawg Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 23, 2014, 06:50 PM
    T and P valve on water heater
    I have a water heater that is at least 8 years old. The T & P valve was intermitantly leaking a little. I replaced it with a new one (T & P only) and the problem persists. The temp is set midrange on the water heater. It seems to leak a little only when water is being used upstairs (shower, dishwasher, etc) The water heater itself is not leaking, is it going bad or do I have a problem somewhere else?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    May 23, 2014, 07:44 PM
    Did you test the house pressure? In many instances, the T&P is fine, the PRV is bad or set too high. Get a pressure gauge and test the tank pressure at the heater. Pressure should not exceed 60 #.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    May 24, 2014, 06:12 AM
    Several things come to mind.
    1- the house PSI is too high **OR**
    2- you need to install a expansion tank on the water heater.
    Good luck, Tom
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #4

    May 24, 2014, 08:54 AM
    You got good advice above from our other Experts.

    FYI: T&P valve is a safety device. It is designed to leak if your water pressure is too high or water temperature is too high, too. Locate the problem and fix it before replacing T&P valve. Once the problem is fixed, install new T&P valve. Only that way it will stop leaking.

    Hope that helps

    Milo
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