The Vitodens 200 is a high-efficiency, gas-fired boiler. Features include an Inox-Radial corrosion-resistant, stainless steel heat exchanger, a MatriX-compact radiant burner, and a Comfortrol programmable control. The unit is available in five sizes: 25 to 91 MBtuh; 25 to 91 MBtuh Combi, a boiler with a built-in hot water heat exchanger; 37 to124 MBtuh; 55 to 172 MBtuh; and 80 to 230 MBtuh.