Review the specifications and installation requirements before ordering.
Navien NCB-250/150H Condensing Combi-Boiler
Find the right heating solution for your home. Review the model specifications below and contact us for help before ordering.
Price per unit · Applicable tax calculated at checkout
Handling: 1–2 business days · Transit: 5–7 business days
All 50 states + Washington, DC. Tracking sent after dispatch.
Coverage provided by Luverlo.
Full terms and conditions apply.
Return eligible unused items.
See policy for terms and costs.
Product specifications & description
Navien NCB-250/150H Condensing Combi-Boiler
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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Durable stainless steel heat exchangers resist corrosion, resulting in longer life and improved heat recovery from flue gases for superior efficiency. |
Separate stainless steel flat plate heat exchanger for DHW creates the lightest flow rates for any combi-boiler in the industry. |
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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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. |
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. |
The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW. |
Dual Stainless SteelHeat ExchangerDesigned for exceptionalheating performance and longevityHeating up to150,000BTUs 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
ZCS
Luverlo Warranty
Luverlo warranty notice: Luverlo provides buyers with a full two-year warranty from delivery on products purchased through our online store. Luverlo pays for parts, labor and shipping for covered defects. Read the full warranty terms and claim procedures.
Before ordering
Gas appliances must be installed by a licensed professional in accordance with the manufacturer’s instructions and applicable local codes. Before ordering, confirm the correct fuel type, natural gas or propane, and ensure your site meets the venting, gas-supply sizing, and installation requirements.
Delivery & returns
Free standard shipping to all 50 U.S. states and Washington, DC. Handling takes 1–2 business days, followed by 5–7 business days in transit, Monday–Friday. Delivery times are estimates.
Eligible unused items may be returned within 30 days. Customers pay change-of-mind return shipping. Refund processing takes up to 14 business days. Warranty claims follow the separate warranty terms.
Warranty & support
Luverlo provides a full two-year warranty from delivery, covering parts, labor and shipping for covered defects.
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