EFM has been working on a rotationg ring stoker that will, I think handle our Chestnut 7/8 - 1 1/2 coal. Portage and Main, and Coalman are the other two and I think they are in the 250,000 BTU range. The other option is a Will-Burt stoker with a Burnham series 4N boiler, some assembly required, this is basicaly what I have with an old Kewanee boiler. I scan Craigslist daily for old units from Prill and others with no results over the last year plus, I've almost gone door to door in the old part of Fairbanks.
I'm trying to solve the large coal issue by making rice coal and bagging it, but I have some small mountains to climb, EFM has helped by test burning Alaskan rice sized coal in a "standard" EFM stoker, with favorable results, see post in EFM manufactures section.
North pole gravel (907-488-8550) has the retail distribution for Usibelli Coal, they load me on Fridays and Saturdays in Healy, 65$/ton, this price has held very steady for a few years. North Pole gravel also has a yard in North Pole and sells for 115$/ton, chestnut or lump no difference, 45lb sacks are 7.00$, pallet of 25 sacks is 175.00$. I think North Pole Gravel represents a burner line and has one heaing thier building. I have no affiliation with North Pole gravel and I doubt they know I exist, other than I have coal account with them.
I would put in heat with oil "liquid death as my grandfather called it" this is practical for resale value and such, also important to have a back up heat system if your primary is coal, as we know it can go down, and in this climate that's not good.
Meanwhile I'm working on getting rice size coal to open up our heating options in Alaska, if you read manufactures web sites from anthicite country, bituminous coal is not compatable with all stokers, getting rice coal and rice coal stokers to hit the market at the same time is problematic