Burnham® Steam Heating Boiler, 7-Section, Series: SteamMax, Natural Gas Fuel, 185 mbh Net IBR, 299 mbh Input, NPT Connection, Spark Ignition, 246 mbh DOE Heating, 82 % AFUE, 120 VAC, <12 A, 8 in Flue Outlet, Atmospheric/Chimney Vent, Cast Iron Housing Material, Floor Mounting, 37 in W x 30 in D x 41 in H Dimensions, Domestic