Patent ID: 7621227

Claim:
A biomass burning furnace system comprising: furnace body including a lower portion and an upper portion, said furnace body further including an inner surface and an outer surface; a burn pot located in the lower portion of the furnace; an ash tray located beneath the burn pot; a three stage heat exchanger system; said three stage heat exchanger further including a first stage heat exchanger comprising a spiral water jacket surrounding the burn pot; a second stage heat exchanger comprising a plurality of heli-coils; and a third stage heat exchanger comprising a finned heat exchanger in the upper portion of the furnace, above said plurality of heli-coils; a fuel infeed system to provide fuel to the burn pot, said fuel infeed system including a fuel channel and a linear actuator mechanism to advance fuel through the fuel channel; a washdown system to remove debris from the inner surfaces of the furnace; an air inducing system to provide air to the burn pot; and a control system to control components of the furnace.