We had a barrel-style stove, and burned mostly cut-up pallets. It did well, boiling over 550 gallons of sap. The pan only holds 18 gallons, so there were lots of late nights.
Since then I've been making some improvements, like recycled redwood siding:
The best shot of all - it's done!
Wood storage is on the back side, in the shade. The top panel with the window tilts out to let out steam when we're boiling. Can't wait to make syrup in style next year!