Round for a Reason LLC is introducing the patented technology, Efficient Solid Fuel Burning Appliance.The patent is for a combustion chamber and heat transfer design. Industrial combustion chambers or combustion chambers for heating appliances. Over 50 stoves and many types of fuels can be built with the technology. Either a furnace, boiler, furnace with a water coil, or a free standing stove can be built with the technology.