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radiator not heating

Small steam boiler 125000 btuh 1 pipe steam. Radiator in kitchen only half getting hot.new return vents. Radiator is at far end of system about 40FT from boiler.Took radiator vent off, no better ,not even hearing air venting.boiler is running full cycles. Other radiators working.Pitch is good on radiator.


    JUGHNE Member Posts: 11,074
    Any water hammer noise? What size is the pipe to kitchen?
    Is all the piping insulated?
  • kennyhinkle
    kennyhinkle Member Posts: 2
    No noise.pipe is 1 inch I think,same as rest.no pipe insulation. Pipe leading to and half the radiator are very hot. I would think I would hear hissing with vent removed.Return line vent was completely clogged
  • AMservices
    AMservices Member Posts: 610
    If you took the air vent off the radiator and all the other radiators are hot, your boiler might be under sized.
    Have you checked the system size by measuring all the radiators?
    How many radiators do you have?
    Are the air vents adjustable?
    If you can close 2 or 3 of your other radiator vents, you may be able to deliver the steam to that last radiator.
  • Jamie Hall
    Jamie Hall Member Posts: 23,426
    Vent on radiator? Return line vent? What return line? I'm confused...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • BobC
    BobC Member Posts: 5,479
    Insulating that line to the radiator might be enough to get it all hot.

    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
    JUGHNE Member Posts: 11,074
    Insulating all the piping might get it there. Pipes were most likely insulated on original installation.
    The basement piping has turned into radiators below your feet.
  • ChrisJ
    ChrisJ Member Posts: 15,767
    Is the kitchen colder than the other rooms?

    What vents are on all of the radiators?
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment