Viessmann CU3A-125 Vitocrossal 300 CU3A 125 Gallon Capacity Gas Condensing Boiler

With its combination of high temperature capability, high mass (water volume), floor standing design, condensing stainless steel construction and modulating gas burner, the Vitocrossal 300, CU3A is the ideal choice for boiler retrofits or new construction. From homes equipped with high mass cast iron radiators, to homes with multi-zone high temperature fin tube radiators, and new installations with high DHW requirements ? the Vitocrossal 300, CU3A is the best choice on the market today.Best value in its class with industry-leading technology and the most standard features.Self-calibrating Lambda Pro combustion management system ensures optimal combustion efficiency at all times regardless of gas/air quality.Zone circuit capabilities provide 3 input connections that allow easy integration of third party components.User-friendly Vitotronic outdoor reset boiler and system control for multi-temperature space and DHW heating.Compact, floor-standing boiler with zero clearance to combustibles.Low-emission combustion for environmentally-friendly operation.Extremely quiet operation; quieter than most refrigerators.High-altitude operation up to 10,000 ft (3,000 m).