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NFB-H Series

High efficiency Condensing Heating boiler


Navien keeps raising the bar higher and higher in fire tube boiler innovations

We totally reinvented fire tube technology from the ground up and we continue to advance our boiler technology to a higher level with the new NFB-H boiler series.


  • Patented stainless steel fire tube heat exchanger—reduces high stress point welds
  • Advanced user interface with intuitive text display and Quick Dial Wheel for easy navigation
  • Smart controls with Setup Wizard to simplify boiler start up
  • Built-in 3 zone pumps or 3 zone valves powered connections
  • Optional NaviLink Wi-Fi remote control
  • Common venting up to 8 boilers
  • Cascading up to 16 boilers
  • Up to 15:1 turndown ratio
  • AFUE 95.0%—Energy Star certified
  • Compact, light weight, wall hung design saves space over traditional floor standing boilers

COMPARE these advantages and see why NFB-H boilers are the right fit for small and large homes


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    Low gas pressure operation

    Negative pressure regulating gas valve ensures maximum performance all the way down to 3.5" of water column on natural gas and 8" of water column on propane gas.

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    Space saving and light
    weight design

    The sleek wall-hung design uses much less space and is substantially lighter than traditional floor standing boilers, making installations a lot easier.


  • Nfc-h-feature-dual-venturi

    Dual Venturi and field gas convertibility

    Dual Venturi system creates better combustion control and turndown ratio. Field gas convertibility is easy with orifice conversion kits for NG high altitude (5,400–10,100 ft.) and LP (up to 10,100 ft.) included with NFB-H Series boilers.

  • Nfb-h-feature-gas-piping

    Uses existing 1/2" gas piping 

    Save time and cost in retrofit application by reusing existing ½” gas lines for up to 24' in length. Subject to local code. 

  • Nfb-h-feature-lownoise

    Low noise levels

    Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running NFB-H boilers.

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    Up to 15:1 turndown ratio

    The sophisticated gas flow control system provides a high turndown ratio which reduces energy waste and excessive boiler cycling.

Patented stainless steel fire tube heat exchanger with
laser weld technology

Navien’s advanced patented stainless steel heat exchanger is designed and manufactured in-house using robotic laser welding to deliver higher product quality. The ASME‑Certified, “H” Stamped, design also reduces high stress point weld failures common on other boilers.

Patented stainless steel fire tube heat exchanger with laser weld technology

Navien’s advanced patented stainless steel heat exchanger is designed and manufactured in-house using robotic laser welding to deliver higher product quality. The ASME‑Certified, “H” Stamped, design also reduces high stress point weld failures common on other boilers.

user interface and controls

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

Built-in hardware to connect a boiler pump, 3 zone pumps or 3 zone valves

With Navien’s new PCB design you now have the ability to connect a boiler pump, 3 zone pumps or 3 zone valves, all integrated in the unit.

NFB-H Manifold Kits

Navien’s NFB-H manifold kits are ideal for hydronic space heating applications. With these manifolds, we have done the piping work for you. Both primary and secondary loop manifold kits are designed to work on all NFB-H models for fast and clean installations. All you need to add is your own appropriately sized pump.

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    NFB Primary Manifold Kit

  • Secondary-manifold

    Secondary Manifold Kit

Common venting up to 8 units and cascading up to 16 units

With Navien’s cascading technology, when a unit gets up to capacity determined by the supply and return temperatures, the next unit will start to help meet the hydronic space heating requirements. This boiler sequence will continue until all units are generating the needed hydronic space heat up to the maximum cascaded capacity.

The Navien cascading system also balances out the workload of each unit for longer life. The NFB-H is dual certified for direct and non-direct venting applications.

NFB-H Models

Max HTG Input: 175,000 BTU/h
Indoor wall-hung
View model
Max HTG Input: 199,900 BTU/h
Indoor wall-hung
View model

Optional Wi-Fi remote control system


NaviLink makes it easy to communicate with your Navien systems anywhere internet service is accessible. The NaviLink module attaches easily to any new or existing* Navien tankless water heater, combi‐boiler and boiler.

* Existing installations may require the purchase of a new main PCB and front control panel. 

Click here to learn more about NaviLink

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on IOS or Android

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