NTI Boilers Watertube Boiler 95% AFUE 10:1 Turndown, 199k-Input, 184k-Gross Output, 135 lbs, Water Content-2.7 gallons, 1-1/4" MPT Heating Connections,3/4" MPT Domestic, 3/4" MPT Gas Connection, 3" Vent Size, Dimensions-18"D x19-3/4"W x34-1/8"H