Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Pressure relief valve

Went downstairs to check my new mod/con's temps and I find my ~10 yr old 60 gallon SuperStor dumping a fairly strong trickle of water onto the floor from the pressure relief valve. I turned off the feed water and cycled the relief lever about 10-15 times and it seems to be holding fine. DHW temp was 140 by the way. Should I just replace the valve? Is this something you've heard of?


  • billtwocase
    billtwocase Member Posts: 2,385
    thermal x tank?

    Have the valve replaced, and check thermal expansion tank, if there is one
  • Stekay
    Stekay Member Posts: 36

    Expansion tank is brand new with new boiler. It hasn't leaked since, but I'm gonna change it out for piece of mind.
  • Zman
    Zman Member Posts: 7,572
    Expansion Tank

    The relief valve on the water heater is for the domestic water and is independent of the the boiler 's water and expansion tank.

    Do you have a domestic water expansion tank?

    You usually need one if your domestic water system has a check valve at the meter.

    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Bob Harper
    Bob Harper Member Posts: 1,040

    Verify the correct size for your thermal expansion tank. Undersized tank can result in overpressure and discharge. 
This discussion has been closed.