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Navien and Hot Water Fancoil
We are building a home in Southern California at the Beach. It is about 2,600 square feet. Alot of glass. Our heating contractor has installed a hot water fancoil by ESP company. He says Heat Loss on the coldest day of the year is about 60,000 BTU and that his fancoil would need about 9 GPM @ 140 degrees to heat the house.
The plumber is installing the water heater and is also installing a a small radiant zone in the basement. The plumber has installed a Navien NCB 240 combi boiler. It has 199,000 BTU.
The contractor who installed the fancoil has expressed concerned that the one unit is not a good choice for the Hot Water Fancoil load + Domestic Hot Water and 400 sq ft of Radiant. He does not think it can supply enough heating and bathing water at the same time.
I would like to get some independent opinions. Any help would be appreciated.