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Oil to gas conversion (yeah, another one)
I'm considering an oil-to-gas conversion, through the HomeAdvance/Sealed/National Grid (Long Island, NY) program.
I currently have a Buderus/Riello 85k BTU boiler with an indirect hot water tank, both of which are about 15 years old. They run fine, I'm just tired of oil deliveries and the jet-engine noise from the Riello. The house is about 1600 total square feet of heated space, using predominantly radiant (quick panel, above the subfloor) with two baseboard zones. I might need to add a zone for the garage, since it's currently heated by being attached to the boiler room. The proposal is to install a Navien NHB-150 boiler, piping into the existing primary/secondary system. Basically, they'll be connecting the supply/return lines and using the existing boiler and DHW pumps. I know there's more involved, but it should be a fairly easy conversion.
One concern I have is about the size of the NHB-150. That's around 75% higher maximum output than my oil system. I understand it's modulating and can drop down to 10k BTU, but still it seems overkill. I also have read mixed comments about the longevity of the Navien.
The program appears to have a fixed price, with a fixed equipment choice, regardless of the actual heat load of the house. So there's no choosing a NHB-110 or smaller system, and no discount for an easier .vs. more difficult install. One price, makes it easier for the sales and installation people. (Okay, I'm being cynical.)
Can anyone offer advice/opinions about this conversion program from National Grid, or the equipment they are proposing?