Navien Combi-Boilers

NCB-H combi boilers offer homeowners higher turndown ratios, wider BTU ranges, longer venting for more flexible installation, an all-new easy-to-use multi-line LCD display with improved controls and intuitive navigation, and an upgraded domestic hot-water module.

Optimized for ultimate combi-boiler DHW performance

NCB-H offers industry leading DHW features including the highest maximum BTU/h for DHW (210,000), highest flow rate of 5.4 GPM at 70° rise and a DHW turndown ratio of 15:1.

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
• Built-in zone controls for up to three zone valves or zone pumps
• Cascade capable with up to 15 NPE tankless water heaters for expanded DHW flow
• High altitude certification... up to 10,100 feet (NG or LP)
• Lowest minimum fire BTU for residential combi-boilers... as low as 10,700

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.

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.

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.
• DHW (Domestic Hot Water) up to 210,000 BTU’s per hour
• Expanded DHW capability
• For increased domestic hot water flow demand, the NCB-H can be cascaded and commonly vented with up to 15 of our NPE tankless water heaters.

NFC-H high-efficiency condensing fire tube combi-boilers offer all the features of our NCB-H series plus the highest heating and DHW performance ever built into one compact combi-boiler system.

New NFC-H highest heating and DHW performance ever built into one compact combi-boiler

Navien innovation, durability and proven fire tube technology has done it again. The new NFC-H has more heating and DHW capacities for today’s larger progressive homes. Navien continues to reinvent smarter ways to bring high efficiency home comfort to your customers. Also Navien continues to make installation and set-up easier for contractors.

Navien takes high efficiency fire tube combi technology to new heights

• 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 residential combi DHW TDR... 15:1 for all models
• Highest residential combi heating TDR... up to 15:1
• Built-In zone controls for up to three zone valves or zone pumps
• Cascade capable with up to 15 NPE tankless water heaters for expanded DHW flow
• High Altitude Certification... up to 10,100 feet (NG or LP)
• Lowest Minimum Fire Btu/H (13,300) for whole house** residential combi-boilers.

*Based on NFC-250/200H.

**Whole house refers to combi-boilers that offer at least 150,000 BTU/H for DHW.

Space saving and light weight design

Navien’s sleek wall-hung combi-boilers occupy 80% less space than traditional floor standing boilers and tank water heater

Easy access to DHW module and valves

All components of the DHW module including the water feed valve, flow adjustment valve, mixing valve and 3-way valve are right behind the circuit board for easy serviceability.

Patented Stainless Steel Fire Tube Heat Exchanger

Navien’s advanced patented stainless steel heat exchanger design is ASME-Certified, “H” Stamped, and reduces high stress point weld failures common on other combi-boilers. This compact, in-house designed and manufactured heat exchanger uses the latest automated laser welding technology to deliver superior product quality.

Advanced User Interface Control With Setup Wizard

Navien’s new backlit control panel is simple and intuitive to use with its plain text display and an innovative click wheel that improves usability for all information input.