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extreme expansion pipe noise in a 3 zone (2 finned, 1 burnham CI ) monoflow T system.
Thinking I can solve the issue by keeping lower temperature water running thru the zones and modulating the water temperature rather than current on/off circulation pump. This is in the 1993 addition, all copper piping, as opposed to the caste iron piping in the other zones. The recessed finned radiator(1938 style) zones would need 180 degrees and do not suffer as severely from expansion noise. The boiler is Weil McLean 260,000 btu 78% efficient (prob way too large for 3800 sq ft home in Chicago area) vintage 1980 approx. running well, but lots of sediment noise. Need to fix the issue for house sale. I've lived with it for ever, but worry it will be a stumbling block for most new owners. Looking for insights prior to discussing with contractors.