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Posted by mystified on March 01, 2005 at 18:39:39:
Help! I have an approx. ten-year-old hot water baseboard heating system that gradually loses pressure until the pipes start to bang. I've been filling it up through the makeup valve about every ten days or two weeks to get it to shut up. I add water until I see about 15 PSI and it gradually bleeds down to about 5 PSI and the pipes start banging when a zone valve opens. Setup is all copper pipes/baseboard heat exchangers, a Weil Mclain CGM-4 boiler, Taco 1/25 hp circulator pump (runs constantly) and two Honeywell zone valves. There are no visible leaks or evidence of water damage, though the bubbler on the air scoop goes off occasionally. I've checked all the registers and visible piping for water leaks with no luck, though the house is built on a slab so I can't check all the pipes. Could it be the boiler itself? A leak under the slab somewhere (I sure hope NOT) I'm mystified.
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