I think expecting one of these stoves to keep the tent warm for hours on end, is not realistic, nor what they're really designed for. You should have a sleeping bag rated to what the outside temp is and expect it to be that cold most of the night. The stove is to warm up when you return from hunting and to dry stuff off in the evening (with continual attention). I'm new to mine, but even with hardwood, I don't imagine I could keep mine really heating on its own for more than a few hours, when loaded up.