NTI Boilers Watertube Boiler 96% AFUE 9:1 Turndown, 85k-Input, 79k-Gross Output, 88.2 lbs, Water Content-1.1 gallons, 1" SWT Heating Connections, 3/4" MPT Gas Connection, 2" or 3" Vent Size, Dimensions-15-5/16"D x15-3/4"W x29-5/16"H