KD Navien® Combination Boiler, Condensing High Efficiency, Series: NCB-H Series, Natural Gas/Liquid Propane Fuel, 11000 to 80000 Btu/hr Space Heating, 10000 to 160000 Btu/hr DHW Input, 1 x 3/4 in NPT Connection, Electronic Ignition, 74000 Btu/hr DOE Heating, 95 % AFUE, 120 VAC, 15 A, Forced Draft Direct Vent, Cold Rolled Carbon Steel Housing Material, Wall-Hung Mounting, 17.3 in W x 12.8 in D x 29.3 in H Dimensions