High Efficiency Condensing Combi-Boiler, AFUE 95%, Space Heating Up to 150,000 BTU/H, Domestic Hot Water Up to 210,000 BTU/H
Dual stainless steel heat exchanger: Durable stainless steel heat exchangers resist corrosion, resulting in longer life and improved heat recovery from flue gases for superior efficiency.
Up to 5.4 GPM @ 70°F temperature rise for DHW: Separate stainless steel flat plate heat exchanger for DHW creates the lightest flow rates for any combi-boiler in the industry.
Dual Venturi and field gas convertibility: Dual Venturi system creates better combustion control and turndown ratio. Orifice conversion kit for easy field gas convertibility from NG to LP is included with every NCB-H Series combi-boiler.
Easy access to DHW module and valves: All components of DHW module including water feed valve, flow adjustment valve, mixing valve and 3-way valve are right behind circuit board for easy serviceability.
Low noise levels: Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running NCB-H combi-boilers.
TDR 15:1 for DHW and up to 11:1 for heating: The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.
Limited Warranty: 5 Years Parts, 10 Years Heat Exchanger
Condensing Combination Boiler
Space Heating Input
60,000 – 150,000 BTU/h
Domestic Hot Water Input:
160,000 – 210,000 BTU/h
Energy Star Certified:
Heat Exchanger Warranty:
2 Years (House Depot)
Navien NCB-H Brochure
Navien NCB-H QuickFacts
House Depot is providing HVAC and electrical services to the following areas: