Manufactured by Buderus, World Leader in Hydronic Heating, the G315 series can be used with #2 oil, natural gas or propane – hot water boiler only. It is constructed of a proprietary flexible GL-180M cast iron with high silicone content designed and manufactured to resist corrosion, thermal shock and provide long life expectancy. The G315 can be ordered factory assembled or knocked down for field assembly. It has a full size burner swing door for easy access to the boiler interior and burner and is covered with a deluxe, heavy gauge blue enameled jacket for a clean finished appearance. The G315 offers a full 3.5” of thermal insulation for minimal standby heat losses, a full three-pass heat exchanger for maximum heat transfer and requires no refractory materials in the chamber due to its unique design. It offers high combustion efficiencies (87% on oil and 84.5% on gas) and Thermostream Shock Proof Boiler design.