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Navien brings their customers the future of fire tube boiler tube technology with the introduction a new Fire Tube Boiler series. The NFB series, Navien Fire Tube Boilers, are designed for residential and light commercial applications. Two models are included at this time: NFB-175 and NFB-200, each offering 170,000 and 199,900 Btu/hour, respectively. Additional features include a new patented stainless steel heat exchanger, ease of installation and service, intuitive interface, advanced controls, and simplified integration with IoT. The 10:1 turndown ratio, 95 percent AFUE, flexibility of venting and remote access via mobile applications are just few of many exciting features that will benefit both the contractors and the homeowners.