The Slant/Fin Galaxy 100,000 BTU Input Natural Gas Boiler is constructed of durable cast iron and has an insulated jacket that provides enhanced energy efficiency. The boiler's advanced-design heat exchanger with a flue-passage design and tapered thermal pins helps ensure uniform heat transfer for a powerful heating performance. The combination gas valve includes manual shut off, pressure regulator, pilot adjustment and 100% shut off and automatic pilot-thermocouple safety.