Navien NCB-250/150H - Condensing Combi-Boiler - 250,000 BTU DHW / 210,000 BTU HTG
The Navien NCB-250/150H is a 95% AFUE condensing combi-boiler that combines powerful space heating and on-demand domestic hot water in a single wall-hung unit. With a maximum input of 150,000 BTU/hr and a net AHRI rating of 120,000 BTU/hr, this unit delivers efficient performance for larger residential applications. It offers a 11.1:1 turndown ratio for heating and a 15:1 ratio for hot water, providing responsive modulation based on system demand.
The NCB-250/150H is field convertible from natural gas to propane and supports a range of venting materials including PVC, CPVC, polypropylene, and stainless steel. It also features compatibility with Navien’s NaviLink smart home controller for remote access and monitoring.
Features:
- 95% AFUE high-efficiency rating
- 150,000 BTU/hr heating input
- 120,000 BTU/hr net AHRI rating
- 11.1:1 turndown ratio for space heating
- 15:1 turndown ratio for domestic hot water
- Field convertible between natural gas and propane
- Smart controls with NaviLink compatibility
- Energy Star certified
- Compact wall-mounted design
- Compatible with 2" or 3" venting (PVC, CPVC, polypropylene, stainless steel)
Applications:
- Whole-home space heating and domestic hot water
- Medium to large residential homes
- Indoor installations with venting flexibility
- Natural gas or propane systems
- Retrofits and new construction
- Smart home integration with NaviLink controller
Aim high with Navien...
High efficiency, High output, High performance, all in one compact combi
- Highest DHW maximum BTU’s in residential combi-boilers...up to 210,000 per hour
- Highest DHW flow rate @ 70°F rise...up to 5.4 GPM
- Highest number of BTU sizes for the North American residential combi-boiler market
- Highest residential combi DHW TDR...15:1 for all models
- Highest residential combi heating TDR... up to 11:1
- Highest number of built-in zone controls for valves or pumps... up to three
- Highest full lineup 2" PVC venting lengths... up to 65 feet
- Highest number of cascade capable units with NPE tankless water heaters... up to 15
- High altitude certification... up to 10,100 feet (NG or LP)
- Lowest minimum fire BTU for residential combi-boilers... as low as 10,700
New Navien NCB-H...the complete combi package and no comprimises
Navien's innovation and technological advancements have done it again. The new NCB-H is taking combi performance to the highest levels. As the competition tries to get closer, Navien ingenuity keeps advancing their lead.
COMPARE these advantages and see why NCB-H combis are the right fit for small and large homes
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Dual stainless steel heat exchangers for heating
Durable stainless steel heat exchangers resist corrosion, resulting in longer life and improved heat recovery from flue gases for superior efficiency.
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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.
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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.
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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.
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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.
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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.
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Dual Stainless Steel
Heat Exchanger
Designed for exceptional
heating performance and longevity
Heating up to
150,000
BTUs per hour
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Built-in DHW module now with
higher performance
Navien’s NCB-H generates enough hot water to run up to 3 showers and a dishwasher at the same time.
Expanded DHW Capability
For increased domestic hot water flow demand, the NCB-H can be cascaded and common vented with up to 15 NPE tankless water heaters
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