How does changing the stack temperature affect the stoves efficiency?
It has minimal affect on efficiency because of the design of the stove. The Sedore burns its fuel at the bottom of the front chamber. Most of the solid fuel is pre-heated into a gas as it is being gravity-fed to the fire. The gas is then almost completely combusted as it has to pass through the fire at the bottom to leave the front chamber. So the stove can operate at lower temperatures and still perform effeciently.