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Thread: Sizing a Pressure Relief Valvle

  1. #1
    DIY Junior Member dlee's Avatar
    Join Date
    May 2010

    Default Sizing a Pressure Relief Valvle

    My heater is 399,900 BTU input and has a working pressure of 75 PSIG. Can I use a 510,000 BTU pressure relief valve witha rating of 30 PSI? The maximum working pressure on one device in the system is 50 PSI and the max presure in the system is 20 PSI.

  2. #2
    Engineer Furd's Avatar
    Join Date
    Jul 2007
    Wet side of Washington State


    Yes. sojkp[owfmz[p

  3. #3
    In the Trades Wally Hays's Avatar
    Join Date
    Nov 2009
    New England


    what type of heater?
    Perception is 3/4 of reality

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