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Posted by HeatPro on May 23, 2006 at 09:38:55:
In Reply to: Re: copper tube boiler groaning/vibrating posted by Dave on May 23, 2006 at 07:53:07:
This is mild weather, so there is the large 140,000 input while only absorbing the 40,000 btuh for the domestic water. Lower the water tank temp to 130-140F while raising the system pressure to see if it goes away.