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I have 1600sqft 3 bedroom Cape in Hartford, CT with a converted gravity system. 100,000 BTU WM WSO-3 boiler with Taco 007 circ pump (return side), 3/4" system bypass and separate zone for indirect HW. The 1st floor has wall type CI radiators with 53,000 BTU total (8 rads), the 2nd floor has free...