I am trying to figure out what boiler will work from my house better. I live in Worcester Massachusetts ZIP Code 01605 in a ranch style house 1076 ft.² built in 1947 with one bathroom. Recently had insulation added in the attic some insulation in the walls still have the original windows. It has a monoflo system with a 1 inch copper pipe out looped around the house. On the connectors on the Monoflo go down to 1/2 and then into 3/4 baseboard 70 feet of high output baseboard heater. So do I go with the 60,000 (NCB-150E) or the 80,000 (NCB-180E) BTU Navien? I was also looking at the Rinnai E75CR but gallons per minute for the DHW seem too low at 2.1 GPM.
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