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Boiler sizing question

dpeartdpeart Posts: 31Member
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.



thanks,

dave
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