Thanks wsherrick, I have 3 stoves right now capable of burning coal. My U.S. Army Cannon heater has moved to storage in my garage because it is simply too monsterous in size and BTU output to run in my raised ranch low ceilings. To put it in perspective my parents heated their 3800 SQ Ft colonial with atrium celings with that stove for 20 years without ever turning on the gas heat. They burned cords and cords of wood. Also, the shaker action on that stove is a dump-grate meant more for burning wood. Depsite my best efforts, I haven't found any way to replace or improve the shaker action for burning coal in it.
My Jotul 507 is what I used last year, and it did an outstanding job. In the end, that stove has an 8 inch round grate which based on calculations found elsewhere on this forum approximates to 31K BTU. It simply didn't have the horsepower to keep up on nights where the temps dropped below 20 degrees. But, all-in-all, I LOVE that stove and its design. The rotating grate and crank shaker handle made it very easy to operate. I just wish they were still produced and that someone would make a larger version of it.
And my most recent aquisition is a Chubby Sr. I've rebuilt it completely (I have a post on that). It has a 12 inch round grate which should get me to the 50K BTU output that I need to keep up with cold temps. The downside is that the shaker action is not as good as easy as the Jotul, and it will burn more coal than my Jotul but that's expected with the increased output.
That said, I'm always looking at other coal stoves and like to get opinions from this forum on them. The circulator seems like it's been around a long time so I wanted to see what everyone thought of it. A thanks to all your opinions!