Why is the water jacket so large?
Many stoves do not have enough water capacity and tend to cycle too often. You load the stove with wood and fire it. With a small water capacity, the water reaches set point temperature and the stove shuts down. The Hardy just has 100 gallons in their base model and 130 in the next model up! You still have a good load of wood in the firebox that sits there and smolders. The Shaver Outdoor Furnace has a large water tank capacity, so you can burn the total load of wood with good draft, burn and efficiency. More water also means more capacity (available BTUs) and the water doesn’t have to be heated as much either.