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NFB-C Series

COMMERCIAL FIRE TUBE BOILERS

Navien’s high efficiency fire tube condensing technology make NFB-C hard to beat and the easy choice for today’s commercial boiler applications

Navien does it all from start to finish…making NFB-C the total package

Robotic and automated manufacturing technology for unmatched quality control.
In-house designed and built components, for system matched compatibility…unlike most competitors who use the same out-sourced parts to build their boilers.
Lower installation costs with our innovative engineered compact wall hung design, intuitive controls, top or bottom piping connections and fexible venting options.
Lower operating costs with the industry’s leading thermal effciency at TE 97.5%…
2019 Energy Star most effcient
Cascading and common venting capable.
Best-in-class training and technical support.
One of the industry’s best warranties.
Top and bottom piping connections for either floor or wall installations.
BMS connectivity (Modbus, BACnet and LonWorks).
High altitude installations up to 10,100 ft.

HIGH EFFICIENCY CONDENSING HEATING BOILERS

Navien NFB-301C

Max HTG Input: 301,000 BTU/H
Indoor wall-hung | Residential/Commercial

Navien NFB-399C

Max HTG Input: 399,000 BTU/H
Indoor wall-hung | Residential/Commercial

97.5% TE Industry Leading Thermal Efficiency
Patented stainless steel fire tube heat exchanger
160 PSI maximum operating pressure
Advanced controls with intuitive 7” color display
Up to 15:1 TDR (turndown ratio)
BAS communication capability
Common vent up to 4 and cascade up to 16 units
Top & bottom piping

Patented compact stainless steel fire tube heat exchanger

Navien’s ASME-certified, “H” stamped stainless steel fire tube heat exchangers are in-house designed and built by the latest in robotic and automated technology, reducing high stress point weld failures common on other boilers.

With Navien cascading technology, when a boiler gets up to 80% of its capacity the next unit will start to help meet the heating system requirements.

This boiler sequencing will continue until the heating load is fully satisfied. The Navien cascading system also balances out the run hours of each boiler for longer life.

NFB‑C: the inside story

Built-in hardware to connect a boiler pump and 3 zone pumps

All integrated into the NFB-C circuit board. Also includes a DHW priority zone.

Protect the environment as you add value

Navien fire tube condensing stainless steel heat exchangers recover additional heat from the flue gases contributing to reduced energy consumption and lower CO₂emissions. Resulting lower exhaust temperatures allow for the use of inexpensive venting materials such as PVC Schedule 40 in almost all applications.