Weil-McLain Ultra 399 - 317,000 BTU Output High Efficiency Boiler (Nat Gas or LP)

Note: Product Title reflects this boiler's IBR Net Output Rating Series 3 Ultra CT Boilers Key Features Gas fired water boiler with cast aluminum heat exchanger Venturi mixing body mixes air and gas providing higher efficiency Designed to operate in low temperature condensing applications Outdoor reset and domestic hot water priority standard Negative regulated gas valve precisely delivers gas to the boiler Electronic control module automatically adjusts blower speed and gas flow rate in response to environment Modulates with 5 to 1 turndown ratio Variable speed motor matches combustion output to heating needs High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications. Propane Conversion Orifice included for LP Gas Applications The Ultra Easy-Up Manifold Kit can speed up installation of the primary/secondary piping required on Ultra boilers. Weil-McLain's Easy-Up manifold kit is designed by the boiler manufacturer and provides the added feat...