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Need advice on converting from oil to natural gas biolers...
Oil prices are killing me and with all the incentives and rebates out there, it is time to switch to natural gas! I spent the last few week reading a ton of info on the internet. I live in a coastal CT town in a 1960 sq. ft wood shingled raised ranch with a timberline asphalt roof. This week I had an energy audit done. My oil boiler is a 25 year old Utica 122K BTUs which runs at 79% efficiency as per the energy audit with 3-zones but on eis slaved into another so I have 2 thermostats. With the blower door test the infiltration was reduced from 4470 to 3830 CFM. The SlantFin heat loss calculated at 41,200 BTUs with a 9 degree design temperature. There are 4 people living in the house and the coil in the oil boiler is inadequate and has been a pita.
What size gas boiler should I look for? Do i have to size up the boiler for hot water? A couple of contractors have suggested a Navien CH-210 Combi with the tankless HW. After reading comments I am not sure about the reliability and maintenance cost of the Navien. I am thinking of a high efficiency gas boiler AFUE 90%+ for the rebates and operating cost mated with an indirect-fired water heater. What size gas boiler and indirect tank should I get?
Does the 41,200 BTUs heat loss sound correct for my size house? Do I have to increase it for indirect hot water heating? One contractor suggested a 96K BTU ballpark whereas another proposed a 175K BTU Navien CH-210asme Combi. Am I underestimated my heat loss?
Any suggestions and comments are greatly appreciated and I will be speaking to contractors this week. Thanks.