Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.


What happens when you replace a trap set at 15 with one set at 125. Will it still work, if not how would you know the 15 trap is the right one?


  • Jamie Hall
    Jamie Hall Member Posts: 23,324
    Say again? What kind of trap, and to what does "set at 15" refer?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Shane_2
    Shane_2 Member Posts: 191
    If by some chance you a talking about replacing a 15lb pressure relief valve with a 125lb pressure relief valve on a steam boiler, NO----DO NOT DO THAT!! That is a safety device and needs to be replaced with the same
  • Steamhead
    Steamhead Member Posts: 16,843
    @Redyed , what is this trap connected to?

    In general, a trap rated for higher pressure has a smaller valve orifice, so it won't do a good job of passing condensate or air at lower pressures.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    EBEBRATT-Ed Member Posts: 15,543

    What @Steamhead said.

    Two traps the same pipe size 1 rated at 15 the other rated at 125 the 125 will have a smaller orifice. It will "work" but may not have the capacity you need