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#928075 - 12/04/17 04:56 PM Kettling?
Bob_Q Offline
Carpal Tunnel

Registered: 06/28/01
Posts: 18089
Loc: Albany area,New York
I guess that is the term.
My boiler,oil feed,hotwater baseboard,started doing this a couple weeks ago.
Sounds like little hammers lightly tapping the pipes. It's not overheating. Thinking it could possibly be air, I changed the Taco auto air bleeder,although it was only a couple years old,but usually if there is air,it makes a whooshing/gurgling sound. Feed valve is working fine. Expansion tank new last year(good hollow sound). Relief is not blowing off.

Any ideas?
It must get boring preaching to the choir.

#928200 - 12/06/17 12:57 PM Re: Kettling? [Re: Bob_Q]
JMac Offline
Super Handyman

Registered: 10/14/03
Posts: 2048
Loc: Cary, North Carolina
Could it be the pipes expanding and contracting as they heat and cool? Rich Trethewey did a segment on this on Ask This Old House a few years ago. The pipes were rubbing on the framing and flooring causing the noises.

Try here: https://www.thisoldhouse.com/how-to/noisy-radiators
Any advice given here is general in nature. Local codes always trump advice given on a internet bulletin board. When in doubt consult your local codes enforcement agency.


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