The Navien NFB-C condensing commercial fire tube boiler delivers up to 97.5% thermal efficiency with a patented stainless steel fire tube heat exchanger engineered for long-term durability and reliable hydronic heating performance. Designed for commercial applications, the NFB-C features up to a 15:1 turndown ratio, advanced touchscreen controls, BAS connectivity, flexible venting options, and field NG-to-LP conversion. Common venting and cascade capability up to thirty-two boilers make the NFB-C ideal for scalable commercial heating systems.

• Patented stainless steel fire tube heat exchanger
• 160 PSI maximum operating pressure
• Advanced controls with intuitive 7� color display
• Up to 15:1 turndown ratio
• BAS communication capability
• Advanced fire tube technology built for scalable commercial performance