Peerless Cast Iron Boiler 84.4% AFUE 175k Input, 148k Gross Out, 129k Net Out, 479 lbs, Supply: 1-1/2" NPT Return: 1-1/4" NPT Heating Connections, 3/4" NPT Gas Connection, 6" Vent Size, Dims (WxDxH) 22-5/8" W x 26-5/8" D x 32-1/4"H