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Navien: NFB-C Firetube Boiler
The NFB-C is a dedicated commercial firetube boiler with a 97.5 percent thermal efficiency and an Energy Star rating. This high-efficiency boiler has a low operating cost that will result in energy savings for the building owner. The compact design offers significant space saving and allows cascading of up to 16 units, with common venting of up to 4 units. Venting can be accomplished with standard materials and up to 150 feet.