Hi everyone I'm a homeowner in the market to replace my old cast iron boiler. I'm looking at going to a 95+ afue modcon boiler to take advantage of the rebates offered by massave. I live in Seekonk Massachusetts. My home is 1092 sqft ranch built in 1963. I've had blown insulation added to exterior walls, new ext. doors and replacment windows and vinyl siding with foam insulation. Attic is insulated with 8" of insulation. Basement is finished and heated with a minisplit heat pump. I currently use a 41 gallon indirect for dhw. I have 84 ft of baseboard on 1 zone and indirect on a second. I will be adding a 24x24 bedroom above a new attached garage at some point which will add another 576 sqft so 1668sqft total. I'm concerned about what size boiler to buy. We have 5 people total living in house which includes 3 teenage girls who love to take showers! House has 1.5 bath but will be adding 1 more full bath with addition. I dont want to oversize the boiler to avoid short cycling and not condensing enough. Based on some calculations I've done I would need a boiler that would mod down to about 17k btu. Does this sound correct? I will be increasing the indirect to a 50 gallon with the new install but was hoping for some help from the pros with sizing the boiler for my application. Looking into a Lochnivar knight boiler or Navien. Thanks in advance.
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