Navien NFB-H High Efficiency Fire Tube Condensing Heating Boilers

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
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these advantages and see why NFB-H boilers are the right fit for small and large homes
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.
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.
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.
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.
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.
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.
Advanced
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.
NFB Primary Manifold Kit
GFFM-MSOZUS-002
Secondary Manifold Kit
GFFM-SKTZUS-001
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
NFB-175H
Max HTG Input: 175,000 BTU/h
Indoor wall-hung
Residential/Commercial
NFB-175H
NFB-200H
Max HTG Input: 199,900 BTU/h
Indoor wall-hung
Residential/Commercial
NFB-200H