Sunny Boy wrote:FWIW, just to compare for grins.
Those 160K BTU ranges are about what a very large oil burner would do. My Oneida oil furnace is rated 250K BTU output with a nozzle rated at 3 gallons an hour and the fan speed up to max. I have a 1.5 gallon nozzle in it and the fan at half speed. That's enough to keep this 4000 square feet of drafty 17 room Victorian heated down into below zero range.
I have my own equipment to do my own tune-ups. It CO2 tests out at about 80% efficient. Because I have extra storage to get best cash price in bulk and have to keep track of when to order, I have about 15 years of measuring and tracking daily oil consumption too. For the coldest months, January and Feb, it averages 20 gallons a day. When it's below zero, it uses about 22-24 gallons a day.
So that should give some info for how well the big coal stoves compare.
Are you burning 220 lbs. of coal a day? That would be an equivalent fuel input.