Peerless Cast Iron Boiler 84.5% AFUE 140k Input, 119k Gross Out, 103k Net Out, 428 lbs, Supply: 1-1/2" NPT Return: 1-1/4" NPT Heating Connections, 1/2" NPT Gas Connection, 6" Vent Size, Dims (WxDxH) 19-1/4" W x 26-5/8" D x 31-3/8"H