NFB-399C - Condensing Heating Boiler - 399,000 BTUNavien 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
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