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Thread: PRV outlet

  1. #1

    Default PRV outlet


    I have a PRV outlet pipe running from beneath my combi-boiler through the wall to the outside of my building. I am wondering if it is okay to redirect it into the overflow outlet beneath the heater, which runs into the general waste pipe of the building. Cheers

  2. #2
    Commercial Plumber markts30's Avatar
    Join Date
    Sep 2006
    Phoenix, AZ


    Probably not legal....
    Check with your local plunbing codes to make sure....

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    That's probably a Temperature and Pressure safety valve, not a pressure reduction valve. The problem with them is that when it blows, the water can be hot enough to flash into steam...very dangerous stuff. If it is leaking, it probably should be replaced - they don't last forever. If it is weeping, double check the state of the expansion tank...it could be shot causing the valve to leak when the boiler kicks in. It is generally safer to have them discharge outside. Check with the local codes.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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