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Burnham Series 2 problem -- water sounds in pipes
I have a 3 year old Burnahm series 2 gas boiler, baseboard heating. Each year, I have the same problem. After the boiler has cooled off for a while (like after a long night of being off), when it turns on a starts circulating the water, it sounds like there is a rushing, bubbling river in the pipes. Not a knocking, like air, but rather like a bubbling brook. After the water heats up, the sound disappears. I've had the system bled each year for the past 3 years, but the problem comes back. The HVAC installers have told me (at the end of the last heating season), to shut off the water feed, shut down the boiler, and watch the guage over the summer to see if it was losing water due to a leak. It held at 20 all summer. They now think that one of the copper pipes that runs through our slab (no basement) has a leak ... the only problem is that the pipes don;t run through the slab, they run over all of our doorways etc. So the HVAC people are now pissed at us for calling them back all of the time, and the noises are driving me nuts. ANy ideas?