leaky wh from overflow tube

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by fast pasquale, Jan 7, 2007.

  1. fast pasquale

    fast pasquale hardwood flooring contractor

    Jan 7, 2007
    Too many to list
    cleveland, ohio
    i have a bunch of rentals and in two of them the overflow tube leaks on the water heaters. Is this as simple as installing a pressure reducing valve?? do i ALSO need to install a expansion tank?? why does this happen.. thanks in advance!
  2. plumber1

    plumber1 Plumber

    Aug 7, 2005
    Rig up a pressure gauge and check the house pressure.

    If it's under 80lbs. just change the relief valve that is leaking now.
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  4. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    The problem could just be a defect TP valve. Simple and cheap to replace. So first check the pressure of your water supply with a gauge. If it is much over 60 psi, you should have a pressure regulator valve on the supply. If you do need a PRV, then you will need an expasion tank too. The PRV creates a closed system which prevents the heated water from expanding back into the water supply and results in a huge rise in tank pressure and trips the TP valve. If the pressure gauge shows normal pressure, then just replace the TP valve.
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