Lotta wood. Well kinda. Seen all the posts about really dry wood. I've find the really dry stuff burns up too fast in the Hardy. I don't have a lot of wood stored up as this is my first winter and didn't know what to expect. The best burns I've gotten are from wood that has been drying just this summer. Overall I'm very pleased with my heater. More wood than a gasification boiler from what I read but very simple to operate. Clean ashes out in the morning, fill it up at night, go inside and relax. It's simple and reliable like myself.