Burnham® Packaged Gas-Fired Steam Boiler, Series: Independence®, Natural Gas Fuel, 76 mbh Net IBR, 105 mbh Input, Electronic Ignition, 87 mbh DOE Heating, 82 % AFUE, 120 VAC, 12 A, 6.5 gal Water/Steam Content, 5 in Dia x 15 ft H Flue Outlet, Chimney Vent, Cast Iron Housing Material, Floor Mounting, 17-3/4 in W x 34-3/4 in D x 40 in H, Domestic