NCB-250/150H – Condensing Combi-Boiler – 250,000 BTU DHW / 210,000 BTU HTG

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

Dual Stainless Steel Heat Exchanger Designed for exceptional heating performance and longevity Heating up to 150,000 BTUs per hour

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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