too many numbers for me

[101x81]

what these numbers tell you???

i did a heat loss calculation for the home and shop witch is 43600 btu/h for the coldest day with a differencial of 87f.
no solar or household gain are calculated.

i burn sugar maple who give me 200m btu/year
no electric baseboard running

where i live, the degrees days are 9000 dd/year witch is how many degrees below 70f for the year

is 200m btu / 9000dd = 22222 btu/dd = 10,4 btu/sq.ft/dd make sense

or 22222 btu/dd / sq.ft. = 19 btu/sq.ft is better

my boiler (conventionnal) took 2 hrs to heat 30 gal. of water(no glycol) to raise the temp from 120 to 210f with 40 pound of sugar maple without any heat load

what this tell you,
there is no efficiency rating for the boiler but i will guess it at 50% or less

thanks

 

[Nofossil]

I dunno - there are a lot of approximations here. Where you are I'd assume a 5 month heating season. Average heat load over the course of the season is usually about half the peak load. In your case, that would work out to about 80 million BTU for the season. Seasoned sugar maple contains 24 million BTU per cord, so if you're burning 200 million BTU worth of maple that would be a bit over 8 cords for a system efficiency of around 40%.

 

[101x81]

thanks nofo

i did my best for the calculations, but the data are reals

i will not surprised with the boiler running at 40%

kerr dont want to give me the efficiency of the boiler

thanks