Commercial Tank Type Water Heater Nat Gas 100 Gal Cyclone Xi 199,000 BTU Input High Efficiency Intelligent control system with LCD display -provides detailed water heater status information Submerged combustion chamber with helical heat exchanger coil - positioned in center of tank PERMAGLAS ultra coat glass lining -exclusive process provides superior protection against corrosion Three year limited tank warranty CSA certified and ASME rated T&P relief valve