By: **lsayre** On: Thu Sep 19, 2013 4:09 pm

For input BTU's (which I agree are what is most likely being advertized), and allowing that carefully lab dried anthracite averages about 13,200 BTU's per pound:

1 Lb./Hr. = 13,200 BTU/Hr. = 24 lbs/day

2 lbs./Hr. = 26,400 BTU/Hr. = 48 lbs./day

3 lbs./Hr. = 39,600 BTU/Hr. = 72 lbs./day

4 lbs./Hr. = 52,800 BTU/Hr. = 96 lbs./day

5 lbs./Hr. = 66,000 BTU/Hr. = 120 lbs./day

6 lbs./Hr. = 79,200 BTU/Hr. = 144 lbs./day

7 lbs./Hr. = 92,400 BTU/Hr. = 168 lbs./day (Keystoker's HFH-90 roughly fits here)

7.5 lbs./Hr. = 99,000 BTU/Hr. = 180 lbs./day (Hitzer 50-93 and Alaska Kodiak and DS-1500 roughly fit here)

I would have to agree with franco b's assessment that the European stove ratings (which are about half of our ratings) may be closer to the overall truth.

For hand fired stoves multiply the above BTU/Hr. figures by about 0.65 to see a fair first guesstimate of output BTU's. Stokers may go as high as 0.80 times the above for output.

Last edited by

lsayre on Thu Sep 19, 2013 6:10 pm, edited 1 time in total.