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New Gorton no. 1 main vent spitting steam

Two weeks ago I replaced two very old main vents (Hoffman I think) with Gorton no 1’s.

today I noticed one is spitting steam once the boiler is on for about 5-10 mins. 

Is this a defective vent? Should I replace with another Gorton no 1 or is this a sign I need another kind of vent?


  • Steamhead
    Steamhead Member Posts: 16,842
    Sounds like it's bad. Gorton is really good about replacing any that don't work.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • CTYankee42
    CTYankee42 Member Posts: 7
    Added info: if the boiler is running for a short cycle no issues. Seems to only happen when the thermostat kicks up for our return home. 

    These two main vents are not mounted on the elbow, has a 6” run of pipe to both vents.