Recent content by Dave in Mass

Thanks to those that read my problem. You were on the right track. It turned out that the schrader valve on the expansion tank was not holding pressure. Recharged it to 15 psi and most of the problem is gone. However, the tank appears to be undersized and I may add a supplemental tank after...

My boiler is a Dunkirk, about 5 years old, with Taco PC700-2 control using outdoor reset. The house, near Boston, has cast iron radiators and cast iron baseboard, and is comfortable. The boiler also has a zone for indirect water heater. The problem is that in very cold weather, recently as...