I really enjoyed my time with a Hearthstone 1 today. Massive and a huge firebox compared to my little Heritage. You could throw large splits in there and really pack it full. The heat output is way higher for obvious reasons and the burn was controllable with the little damper and Fisher style air screw adjustment on the side door. The picture doesn't offer a good glimpse into this box, but these splits which are decent sized were put in the middle with a good foot of clearance on the far side away from the side door. In other words, she could hold quite a few large chunks of wood if it was really cold outside and you were looking for a long burn. I think firebox is in the 4.4 cubic foot range and there is no delicate baffle at the top that you have to gingerly load around. Given the age and weight, not a stove for everyone, but I really liked test driving one today.