NFB-399C – Condensing Heating Boiler – 399,000 BTU

Navien NFB-399C – 399,000 BTU Condensing Heating Boiler

The Navien NFB-399C is a commercial-grade condensing boiler engineered for maximum efficiency and performance. With an impressive 97.5% thermal efficiency and a 15:1 turndown ratio, it delivers reliable operation across a wide range of heating demands. This model features a patented stainless steel fire tube heat exchanger, an intuitive 7″ touchscreen control interface, and flexible venting options. It’s approved for high-altitude installations and is compatible with building automation systems through BACnet, Modbus, or LonWorks.

Features:

• 97.5% thermal efficiency
• 15:1 turndown ratio
• Stainless steel fire tube heat exchanger
• 7″ color touchscreen interface
• PVC, CPVC, polypropylene, and stainless venting options
• Common venting up to 4 units, cascading up to 32
• Built-in pump relays for 3-zone systems
• Top and bottom piping connections
• Low NOx emissions
• Approved for altitudes up to 10,100 ft
• Compatible with BAS protocols (Modbus, BACnet, LonWorks)

Applications:

• Commercial buildings with high heating demands
• Boiler banks requiring cascading and common venting
• Energy-efficient system upgrades
• Installations requiring top or bottom piping flexibility
• Multi-zone hydronic systems
• High-altitude commercial environments

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