Over 70 Years experience in producing anthracite coal heating equipment to provide an economical solution to high cost of today's energy. Our boilers are built with heavy gauge high quality American made steel and are equipped with a copper coil that will produce 5 gallons of hot water every minute. The Keystoker warm air furnace is built to deliver maximum heat. The downdraft heat exchanger increase heating surface permitting direct circulation of every thermal unit into the warm air leader pipes for rapid distribution.