Burnham® Gas Boiler, 8-Section, Series: Series X-PV, Liquid Propane Fuel, 163 mbh Net IBR, 220.5 mbh Input, NPT Connection, Spark Ignition, 187 mbh DOE Heating, 84 % AFUE, 7 gal Water/Steam Content, 4 in Flue Outlet, Chimney/Direct/Power Vent, Cast Iron Housing Material, Floor Mounting, 27-3/4 in W x 26-1/2 in D x 37-3/4 in H Dimensions, Domestic