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

    Dec 7, 2012, 08:40 AM
    Water Pressure
    What is the maximum water pressure for a domestic dwelling?
    How will this affect boliers?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #2

    Dec 7, 2012, 11:30 AM
    What is the maximum water pressure for a domestic dwelling?
    About 60PSI should be about tops and your boiler will handle that. Good luck Tom
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #3

    Dec 7, 2012, 06:29 PM
    Most all codes in the US say 80psi max. As for your boiler, it depends on what you are calling a boiler. If it is a boiler for hot water heating, it needs to have a pressure reducing valve to bring the pressure of the boiler down to roughly 12psi.
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
     
    #4

    Dec 7, 2012, 06:58 PM
    Yeah, 80 PSI is a max. and anything near or over that requires a pressure reducing valve be installed. Boilers, as mentioned by MGD77 should have a pressure regulating valve that sets the pressure at the boiler between 12-20 PSI (maximum). Here, as temperature increases (and thus pressure) you will see a fluctuation in pressure (usually handled by the expansion tank) that can exceed the 12-15 PSI the typical boiler pressure regulating valve is "factory set" at, but this range.. 12-20 PSI is reasonable as a whole! Anything beyond that can be a problem for cast iron radiation systems, for sure!

    Mark

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