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Steam radiator problem

Kitchen radiator sounds like running water, banging and tons if air being released from the SRV at the end of the heating cycle. Had a plumber look at the radiator, all good. Thinks it may be a problem at the boiler, too much pressure even though it's set at the lowest setting and the gauge works. Could it be the main SRV above the boiler not working  and that kitchen radiator taking the brunt of too much pressure? Any assistance appreciated!


  • Jamie Hall
    Jamie Hall Member Posts: 22,910
    If the pressure control is working properly and the boiler really is shutting off at 1.5 psi or so, pressure is not your problem. However, that's an if. Is the pigtail to the pressure control clear so the control can see the boiler pressure? Is it really shutting off at that pressure? And what gauge -- a 0 to 3 psi gauge? A 0 to 30 psi gauge won't tell you anything.

    Further, while air should be released from the vent at the beginning of a cycle, no air or steam should come out later, when the boiler is warm -- and no air will come out at the end, although air may be sucked in.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England