So last night at 11 PM and the stovetop on my Osburn 2400 at 300 degrees, I placed three pieces of wood in and within 30 minutes it was red hot and around 400 degrees, air all the way shut. House was a nice 72 degrees. It still blazes even though the rod is pushed in all the way. With my old cat stove, no way. I could chock it down to nothing. Get up around 3 to walk the dog, and just a bed of coals, house is 68 degrees. Put in 3 more pieces, hang out, shut it down, get up at 6, and coals, house at 66 degrees. It seems if you get the box temp up to 400, the would you put in burns up quickly, and is not controllable with the rod all the way in. If you drop the temp of the box to 200 degrees and add a few pieces, it takes off again and burns out fast. It seems like there is no happy medium!