The Navien NFB700-C condensing fire tube boiler delivers high-efficiency commercial hydronic heating with up to 97.5% thermal efficiency and capacities up to 1,000,000 BTU/h. Designed with a stainless steel fire tube heat exchanger, the NFB700-C features a 15:1 turndown ratio, built-in Wi-Fi controls, and cascade capability for up to eight boilers. Flexible venting, NG-to-LP field conversion, ultra-low NOx emissions, and ASME H-stamped construction make it a powerful solution for demanding commercial boiler applications.

• 97.5% thermal efficiency* (Based on U.S. Department of Energy (DOE) test procedures.)
• Up to 15:1 turndown ratio
• 162 PSI maximum operating pressure
• Stainless steel fire tube heat exchanger
• Smart controls with 10.1� color touch display and built-in Wi-Fi
• High-capacity fire tube performance for complete commercial system comfort