How deep do you usually keep your coal bed? When we're doing nice long burns that can be allowed to die down without freezing the house we usually end up with a decent amount of coals, I'd say the average is just over enough to cover the bottom of the stove, maybe 1" deep, if more we usually burn them down to that amount. We've been having to load more often and at higher temperatures to keep up with these bitter temperatures so even after letting them burn down for 1/2 an hour or so the coal bed has been about 4" deep. Our stove box is very big so I haven't really had to put less wood in than normal, it just gets a little closer to the top. To be honest it's kinda nice how quickly that many coals light the fire, I know my wife is having a lot more success, she's been running this thing like a rock star while I'm at work. Anyway, just curious... Stay warm!