The NFB-C is available in two sizes: NFB-301C (301 MBH) and NFB-399C (399 MBH). The in-house designed and manufactured heat exchanger is form-pressed and robotic laser welded to minimize the number of weak points that could be prone to thermal stress and corrosion. The 97.5% thermal efficiency NFB-C series includes a 15:1 turndown ratio, top and bottom piping connections for installation flexibility, an advanced 7-inch color touchscreen display with easy intuitive navigation for setup, troubleshooting and operation, extremely low NOx levels, 3” venting up to 60’ or 4” up to 150’ with PVC/CPVC/PP/SS Approved Materials, and Modbus/BACnet and LonWorks to BMS communication capability.

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