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Cold spots on steam radiator

Big Ed
Big Ed Member Posts: 1,117
Maybe the radiator steam vent was installed incorrectly in the upper hydronic tap ?


  • SC
    SC Member Posts: 26
    Cold spots on steam radiator

    One pipe system, the radiator has several cold spots. Pitch is good. Any ideas.
  • T-O
    T-O Member Posts: 29

    I don't understand "several cold spots" - Usually if a raiator had a cold spot is lower half sections from about the the middle to the air vent section.
  • chuck_6
    chuck_6 Member Posts: 107
    Cold spots - may need more venting capacity


    You may need more venting capacity on the radiator. I would only go with Gorton vents. Try a Gorton C or D. The D is the most open. You may also want to make sure that your main vents are properly vented. Speak to Ken at Gorton. His number is (908) 276-1323.

  • soot_seeker_2
    soot_seeker_2 Member Posts: 228

    ...do not heat evenly.

    On a one pipe steam radiator, the steam enters the bottom and rises into the first few columns. It works its way along the bottom nipples rising up columns as it goes from supply to vent. It usually rises up the last column, lkeaving several of the last columns cool on top before it closes the vent.

    These cool sections represent an air bubble which will work itself out as the vent opens and closes, as long as the boiler's pressurtrol setting does not exceed the vent's drop away pressure.

    So it's normal for a one pipe steam radiator to have cold spots unless the day is cold enough to require a long run time of the boiler.

    Long Beach Ed
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