KD Navien® Fire Tube Boiler, Condensing High Efficiency, Series: NFB-H Series, Liquid Propane/Natural Gas Fuel, 13300 to 199900 Btu/hr Space Heating Input, 1-1/4 in NPT Connection, Electronic Ignition, 183000 Btu/hr DOE Heating, 95 % AFUE, 120 VAC, 15 A, 4.5 gal Water/Steam Content, Forced Draft Direct Vent, Cold Rolled Carbon Steel Housing Material, Wall-Hung Mounting, 17.3 in W x 17.3 in D x 27.6 in H Dimensions
KD Navien® NFB-H Series are condensing Boilers featuring patented fire tube stainless steel heat exchanger, advanced burner system, smart controls with intuitive user interface, industry leading AFUE of 95%, built-in three zone pumps or three zone valves and turn down ratios up to 15:1.