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.

Steam Air Vent Pushes Air All at Once

njwags95 Member Posts: 15
Steam 4 foot baseboard on 2nd floor bedroom air vent releases all air at once, not gradually, making a loud whooshing sound. This seems to happen in the early morning when the system is heating from 65 to 68. Air vent is a Varivalve. Any ideas? Thank you.


  • JohnNY
    JohnNY Member Posts: 3,226
    That's not what's happening. And baseboard and steam, assuming it's a 1-pipe system, is a bad combination that'll never work well anyway.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
  • njwags95
    njwags95 Member Posts: 15
    Yes, one pipe system. Half the house has baseboards, some longer. This one is the only that behaves this way.
  • Intplm.
    Intplm. Member Posts: 1,786
    What happens when you adjust the valve?
  • Fred
    Fred Member Posts: 8,542
    Post a picture of that "baseboard" Let's see what you are calling a baseboard and where the vent is. Varivalves are probably the worst vent you can put on a steam system. They vent too fast for a radiator.
  • RayWohlfarth
    RayWohlfarth Member Posts: 1,429
    Sounds to me that the main air vent may not be working or undersized. Had the same thing on my one pipe system at my house
    Ray Wohlfarth
    Boiler Lessons
  • njwags95
    njwags95 Member Posts: 15
    This is the baseboard with the Varivalve to the right. I currently have it 1/3 open since it was mentioned it releases air too quickly. Thanks.