Burnham® Water Boiler, 5-Section High Efficiency, Series: X-2 Series, Natural Gas Fuel, 102 mbh Net IBR, 140 mbh Input, NPT Connection, Spark Ignition, 117 mbh DOE Heating, 85 % AFUE, 120 VAC, <12 A, 4 gal Water/Steam Content, 6 in Flue Outlet, Chimney Vent, Cast Iron Housing Material, Floor Mounting, 19 in W x 32 in D x 40 in H, Domestic