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Old 02-17-2009, 12:07 AM   #1
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HW Baseboard gurgling


Air is constantly in the 2nd floor of my HW Baseboard system (2 zone, 2 pumps) even after I purge it out. The boiler is on the discharge side of the pumps, with the diaphram expansion tank and fill at the boiler high pressure releif valve. Boiler manufacture (weil mclane) recommended to repipe system to have boiler on suction side of pumps and move expansion tank & fill as well. I also heard from a contractor that the individual bleeder valves on each slant fin unit may fail and eventually leak air into system. I checked the bleeder valves, no water leaks observed. Is it possible for bleeder valves to leak air in although no water leakage is observed?

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Old 02-17-2009, 02:33 AM   #2
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HW Baseboard gurgling


Yes, its possible, and happens a lot.

What pressure is your boiler at.

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Old 02-17-2009, 02:47 PM   #3
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HW Baseboard gurgling


boiler pressure is set to 12-15 psi. The bleeder valves I'm mentioning are the ones at each slant fin unit, 7 per floor. Can they leak air into system even though no water leakage is observed?
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Old 02-17-2009, 05:19 PM   #4
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HW Baseboard gurgling


If they are automatic ones, yes.
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Old 02-17-2009, 05:54 PM   #5
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HW Baseboard gurgling


the bleeder valves are manual, I have to physically turn them counter clock wise to purge air & slight water at each slant fin unit. Can the valves still leak in air even though they are closed tight?
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Old 02-17-2009, 06:06 PM   #6
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HW Baseboard gurgling


Manual valves are ok to use.
Unless they are defective/broke, they don't leak air back in.

Sometimes, depending on how the piping is ran.
You need to purge the line, and then bleed the baseboard.
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Old 02-17-2009, 09:36 PM   #7
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HW Baseboard gurgling


ok, thanks.... I will repipe boiler/ system this summer as per manufacture recommendations. This website is great..

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