Whistle from hot water baseboard

Old 02-24-12, 11:12 AM
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Join Date: Oct 2010
Location: USA
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Whistle from hot water baseboard

I noticed today there is a faint high pitched whistle coming from the corner of my room. You wouldnt hear it unless its silent. I traced this to the 90 degree elbow that turns the corner between two baseboards (all copper piping). I checked it for leaks and everything looks dry. It only seems to whistle when the circulator is on. Every other baseboard and elbow in the loop is quiet as well as the entire loop of the second zone. Both zones are on one circulator. Only this one corner wistles. There are no bleed valves on this system, its all copper pipe into baseboards. Any ideas? Thanks for the help!!
Old 02-24-12, 11:21 AM
Join Date: Oct 2008
Location: USA
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Probably due to flow turbulence in the el. You could try replacing it with a wide-sweep el. Or, wrapping the el with fiberglas to help attenuate the noise.

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