We have several used woodboilers. Refurbished and ready to go. Also have our new Woodboilers and gasification systems. Gasifiers are 90% efficient. Our woodboilers use only 4-7 cords of wood to heat 3000 sq ft. All are made of a refractory cement that will not crack or rust. All are fully insulated and come with a warranty. Order a new heater now and get 50 ft of pex free. Save hundreds on this years pricing. Check us out at Heissheaters.com or call 616-232-0373_