NTI Boilers Firetube Boiler 96.1% AFUE 10:1 Turndown, 1200k-Input, 1,153k-Gross Output, 1210 lbs, Water Content-34 gallons, 3" Groove Joint Heating Connections, 1-1/4" FPT Gas Connection, 8" Vent Size, Dimensions-45-7/16"D x33-7/8"W x66-1/4"H