As far as btus I read a few places that for anthracite nut coal I would get 13,000- 15,000 btus per lb. So I took the average of 14,000 X 50 lbs. And got 700,000 divided by hours per bag. I didn't get anymore complicated than that. Didn't know much less expect the math to be spot on.lsayre wrote: ↑Tue. Dec. 29, 2020 5:07 amFor 50 Lbs. of coal feed every 30 hours I see this at about 20,500 BTUH as input, and about 14,500 BTUH as output (the actual BTU's heating your house). On the very coldest days of the year you may see this triple.
How many sq-ft of floorspace are you heating? New construction? Well insulated? Single story?
Single story stick built modular year 1955
1155 square feet. Insulation 16"-18" attic and some sort of foam board or spray in, not sure in the walls. Floor now has 1" foam board with aluminum reflective barrier on both sides.