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Replacing old cast iron boiler with - Bosch SSB, Navien, Lochinvar?
Ripped out the old Weil Mclain 210K cast iron boiler and old radiators in my house and wanting to replace it with one of these listed above. I'm in the Hudson Valley and the house is circa 1900, 2 floors, 3 bedrooms. No insulation at all just lathe and plaster. Coldest it gets here is about -9ºF but that only lasts a few days, average is about 10ºF at night
It's 2400 sq ft. and had 12 old school large cast iron radiators in it (7 downstairs, 5 upstairs). Coming from the boiler was 3" cast iron pipe splitting off to 1.5" cast iron going into the radiators.
Attached is the heat loss calc that I did (per floor). I'm leaning towards the bosch ssb 120K boiler and am planning to install hudson reed traditional cast iron radiators with it. Would very much appreciate any input and any opinions at all! Thanks