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Old 12-08-2008, 10:36 PM   #1
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Why do i hear the water in my heating pipes?

I have forced hot water heating; when the heat turns on, i can hear the water in the pipes (loudly). Is this normal?


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Old 12-09-2008, 10:21 AM   #2
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I would think so.


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Old 12-09-2008, 10:47 AM   #3
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It depends on what the noise is. If it sounds like water trinkling, and it's always the same place you likely have air in the line the water is trinkling around. You can bleed that baseboard which should eliminate the sound. Also, the sound may move around to each baseboard if it's air, which is harder to isolate where the air pocket moved to when you start bleeding. You only need bleed the baseboards with a $0.59 baseboard bleeding key from HD, and it's really easy. Take off the side covers of the baseboard making noise, one will have a bleeding valve and looking at it things should make sense. They have a nipple to attach a small tube hose and if you're lucky the valve has a wingnut on the top, otherwise you need that $0.59 key at HD. Attach a tube to the nipple that ends in a bucket, open up the valve and let it fly for a period until you see it spit out air hopefully. Keep it going for a period of time to make sure all of it is out. You may want to do each baseboard in your house. When you're sure there's no air, close it and put the sides back on and you should be done (unless you want to bleed all the baseboards).

If it sounds like a thumping noise that's another issue. The holes for the pipes weren't made big enough when it penetrated floors/framing and as the pipes get hot they want to expand and are held back by the tight fit until they build up enough energy to slip and it comes out as a hammer or thud type of sound. It's not easy to fix holes that were made too tight and don't allow the pipes to expand/contract freely.

Last edited by Piedmont; 12-09-2008 at 10:57 AM.
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Old 12-09-2008, 11:33 AM   #4
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Make sure the pressure is up on the system on the system before attempting to bleed the air out.
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