valley trash wrote: Is a 10 to 12 hour burn realistic for sub-bituminous in a Hitzer 55 or 82?
The 55 would probably be fine however since no one will be there to tend it for 12 hours I would probably go with the 82, bigger firebox= more coal=more heat with longer burn time. The 82 looks to have 7" flue so I would recommend expanding to 8" right off the stove and continue 8" for the entire chimney as this coal you plan to use will be smokey and could produce lots of soot. I would check the flue for soot buildup daily when you first start using this coal to see what the buildup rate is. Hopefully your installation will have a section of stovepipe or 90 degree elbow that would be easy to slide apart just far enough to see how much buildup there is.
Since there are roads, you might want to check coal prices elsewhere, you may be able to save a lot by hauling it in yourself. You could try to find out where your local guy gets the coal and bypass him altogether by getting it directly from his supplier.
BTW, does this local coal dealer (or any others in the area) sell stoker coal (coal size 1.5 inch and smaller)? If he does, you could send me a PM (private message) and I will explain the type of stove that uses this coal. This type of stove can run a couple days with no tending.