Burnham® Gas Boiler, 7-Section, Series: Series X-PV, Natural Gas Fuel, 156 mbh Net IBR, 210 mbh Input, NPT Connection, Spark Ignition, 179 mbh DOE Heating, 85 % AFUE, 6 gal Water/Steam Content, 3 in Flue Outlet, Chimney/Direct/Power Vent, Cast Iron Housing Material, Floor Mounting, 24-3/4 in W x 26-1/2 in D x 37-3/4 in H Dimensions, Domestic