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So I'm reading and trying to learn this stuff enough to pick someone to replace my boiler. I ran a couple heat loss calculations on the house. It has zero attic insulation, zero floor insulation in the crawl space, does have storm windows and 8-10 inch brick walls. I'm assuming it leaks like a sieve.
I also added up the total EDR for the house (as best as I can) and got 547 x 1.33 = 728MBH which matches the BB14-*-5 boiler in the basement. It is rated at 705-770MBH.
I then did a heat loss calculation and came up with 240MBH @ 15F, or 303MBH @ 0F. 15F being what VA is rated at.
If I go in and insulate the attic and crawl space, and reduce air infiltration by 50% those numbers drop significantly to 128MHB @ 15F and 162MBH @ 0F.
Now for the sizing question. Everything I've read here is that you size the boiler to the EDR capacity. After I install the insulation I don't need that much heating capacity. Do I still go with a big boiler, replace the radiators with smaller ones so I can go with a smaller boiler? I've not read anything on what to do when you have more EDR than you need due to improvements you made to the house.