Thanks for the feedback everyone. I was asking about wood pellets, I know there is no way they would work as well as coal in a Stokermatic but my dad was hoping he could mix them with coal or just use them at the end of the winter. The coal is extremely cheap for employees, around 30 a ton. He can't stock up because they only offer coal sales from fall to spring, and the mine decided to quit stoker coal sales this summer. He doesn't want to go through the hassle of screening coal, but I think I might do it for him.
I'm thinking of buying a Harman forced air SF 1500 and could use all the larger chunks and give him the stoker and smaller size. Would work out well for us both. I have no experience with hand screening coal, although I have a lot of experience with the facility the stoker coal came from.
Any advice on hand screening coal, the Harman forced air SF 1500, or stokermatics using other fuel sources would be appreciated.