This is my Rangeley burning ideally. The flames kicked up a little before I started recording, but this is exactly how this stove was designed to burn (please see video Jotul Rangeley Perfect Burn 2011-11-11). Note the position of the primary air and the surface temp towards the end. It burned about 7 hours like this. This morning there was about 2" of hot coals on the grate. I threw wood on, turned up the primary air, waited about 5 minutes, and it blazed right up again! What a heat machine! Way to go Jotul!