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  • Dec 7, 2012, 08:40 AM
    Dedgie
    Water Pressure
    What is the maximum water pressure for a domestic dwelling?
    How will this affect boliers?
  • Dec 7, 2012, 11:30 AM
    speedball1
    Quote:

    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
  • Dec 7, 2012, 06:29 PM
    mygirlsdad77
    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.
  • Dec 7, 2012, 06:58 PM
    massplumber2008
    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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