Navien NCB-240/110H Condensing Combi Boiler
Navien NCB-240/110H - Condensing Combi-Boiler - 199,000 BTU DHW / 110,000 BTU HTG
The Navien NCB-240/110H is a 95% AFUE condensing combi-boiler designed to deliver both space heating and domestic hot water in one high-performance, wall-mounted unit. With a maximum heating input of 110,000 BTU/hr and up to 199,000 BTU/hr for DHW, it efficiently meets the demands of larger homes or applications with simultaneous heating and hot water needs.
This combi-boiler operates on natural gas or propane and includes advanced features such as dual stainless steel heat exchangers, a smart control interface, and built-in zone pump and valve terminals. With turndown ratios of 8.5:1 for space heating and 15:1 for hot water, the NCB-240/110H adapts efficiently to fluctuating usage demands, reducing wear and energy waste.
Features:
- 95% AFUE high-efficiency rating
- 110,000 BTU/hr heating input
- Up to 199,000 BTU/hr DHW input
- 8.5:1 turndown ratio for heating
- 15:1 turndown ratio for domestic hot water
- Smart controls with backlit LCD and Setup Wizard
- Dual stainless steel heat exchangers
- Field convertible between natural gas and propane
- Built-in zone pump and zone valve connections
- Compact, wall-hung design with quiet operation
- Supports 5.1 cm or 7.6 cm direct venting
Applications:
- Residential space heating and hot water
- Homes with simultaneous multi-fixture usage
- Natural gas or propane fuel systems
- Installations requiring compact, high-efficiency units
- New construction or retrofit boiler replacements
- Indoor wall-mounted applications with venting flexibility
- Highest DHW maximum BTU’s in residential combi-boilers...up to 210,000 per hour
- Highest DHW flow rate @ 21.1 °C 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 5.1 cm PVC venting lengths... up to 1981.2 cm
- Highest number of cascade capable units with NPE tankless water heaters... up to 15
- High altitude certification... up to 10,3048 cm (NG or LP)
- Lowest minimum fire BTU for residential combi-boilers... as low as 10,700
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 exchangers for heating
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 @ 21.1 °C 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.
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 withhigher performance
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Most orders ship within 1-3 business days.
All major cards accepted, protected checkout.
New and factory-reconditioned items are covered. See product details for warranty length.
Orders are processed within 1-3 business days. Large equipment ships via freight with delivery scheduled by appointment. See our Shipping Policy for details.
Most items can be returned within 30 days of delivery for a full refund, less original shipping costs. See our Refund Policy for full details.
Factory-reconditioned items are inspected and serviced by the manufacturer to meet original performance specifications, and are covered by warranty. Check this product's title and description to confirm its condition.
Yes. Manufacturer warranty terms apply as noted on this product page. Contact us if you need help with a warranty claim.
Have a question about fit, specs, or which model is right for you? Contact us and we'll help you decide.
Customer reviews
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Really happy with this purchase
We needed a reliable boiler for a growing household and this one delivers. Noise level is lower than I anticipated, which matters a lot in an open-plan space. Worth every penny in our opinion.
Works better than expected
Picked this up after comparing a few options and I'm glad I went with the Navien version. The listed spec capacity is genuinely useful and matches what was advertised. Five stars from us, no hesitation.
Good enough for the price
A solid middle-of-the-road option if you're not looking for premium features. It's a bit bulkier than the pictures suggested, so measure your space first. We'll keep using it but wouldn't call it a standout.