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Navien’s new Fire Tube Boiler line will be on display at the AHR expo in Chicago this January. The NFB, Navien Fire Tube Boiler, is designed for residential and light commercial applications. Four models will be displayed at AHR: 175,000, 199,000, 299,000 and 399,000 Btu/h, each offering a new patented heat exchanger design, 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 the features that will benefit both the contractors and the home owners.