Users start by placing a log (a section of tree trunk, really) on the adjustable-height support stand, then pushing it into the cylindrical stove – presumably a small fire has already been started in there, using kindling. Once the business end of the log is in, a steel diaphragm is closed around it. From there, users just periodically push the log in a little farther, as the end of it burns away.
The stove itself features fireproof concrete bricks on the inside, to absorb and radiate heat. It also has steel fins on the outside, to increase its heat-radiating surface area.