I'm am going to replace the 20 year old Weil Mclain NG hydronic boiler in my primary home in SEMass. The house is 2x6 construction with new energy star windows and exterior doors, and has three zones, one of which heats a radiant system in our 280 square foot family room.
The btu calculators online seem fairly generic, plus won't let you choose both baseboard hot water, and radiant heat. The closest I came up with is 50,800 btu's, which sounds about right as the boiler also makes DHW with a 30 gallon Super Stor.
I would like to take advantage of the $1500 rebate for a >=96% unit. The choices I have seen so far are Lochinvar, Viessmann, and Triangle Tube. I appreciate any info please.