Combination boiler series
Navien’s NFC Fire Tube wall-hung units are suitable for residential and commercial applications. Sizes range from175,000 to 199,900 BTUH, with 95% AFUE efficiency and turndown ratios of 11:1. Venting is up to 60 feet through 2” pipe, or up to 150 feet with 3”. Common venting of up to eight units and cascading of up to 16 units is possible.