Wood boiler heats up 8000 square feet, BTU 280,000 complete with heat exchanger, circulating pumps, some valves, radiators for forced air heating. Made out of boiler plates 1/4 inch thick. Was on on warranty for 30 years and we used it for 7 years. Great for keeping the mess outside, burns up to 3 foot lengths of wood. We are selling for the reason of not wanting to deal with wood anymore. Cuts your heating bill down. Call Ken for more information.