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hisssssssssing radiators

50 year old radiators,but 7 year old gas furnace.

Reaplced 'some' of the valves on radiators and they are hissing when heat comes on.

Should I turn them "off" (kobs, not valves) doesn't that defeat the purpose?



  • Daniel_3
    Daniel_3 Member Posts: 543
    Where to begin . . .

    First post in years but there could be a myriad of reasons for the steam vents hissing. It's a boiler, not a furnace you've got. Single family dwelling? Probably not in Brooklyn. Apartment or row house? Panting and hissing steam vents (lil silver thingys on the end of the radiator) typically is the cause of an imbalanced system due to multiple malady's. No main vents and high pressure at the Pressuretrol. Bad vents or halfway closed radiator angle valves. Lot's of questions . . . . Give us more info.
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
    Noisy vents

    Get a copy of the lost artf of steam heating from the shop here, and it will show you how to make these systems work better. Also get a low pressure gauge from gauge store.com, (0-3 psi), and have it put on the same pigtail as the pressuretrol. This will show you how the boiler is doing.

    Never turn off or down the inlet valves.

    In the case of hissing vents, there is probably not enough main venting, and the pressure is too high. That is the sound of extra money being removed from your wallet for more fuel to squeeeeeze the air out, instead of letting it escape. Sometimes this can be 15%--NBC
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