NTI Boilers Watertube Boiler 94% AFUE 4.4:1 Turndown, 700k-Input, 658k-Gross Output, 425 lbs, Water Content- gallons, 2" FPT Heating Connections, 1" MPT Gas Connection, 6" Vent Size, Dimensions-63-1/2"D x17"W x37"H