Navien has introduced the NFC series stainless steel fire tube combi-boilers. This product is available in two sizes, NFC-175 (175,000 BTU/H) and NFC-200 (199,900 BTU/H), each offering 95 percent AFUE, 11:1 turndown ratio, PVC venting up to 150 feet, high-altitude approval up to 10,100 feet and residential and commercial warranties.
The Navien NFC combi-boiler models come with a patented in-house designed and manufactured heat exchanger, Low Profile Burner for ease of service, controls offering user navigation, a built-in DHW module (pump, flat plate heat exchanger, 3-way valve, mixing valve, water adjustment valve and auto water fill valve), venting capability up to eight units, cascading capability up to 16 units, and built-in hardware to connect up to three zone pumps without a need for additional external controllers.
Each NFC unit will ship with 16 accessories including a NaviClean magnetic filter, an isolation valve kit and an NFC primary loop manifold for installation ease.
Navien also unveiled the NFB-C commercial fire tube boiler. Shown in two sizes NFB-C-301 (299,900 BTU/H) and NFB-C-399 (399,900 BTU/H) the NFB-C uses the same patented stainless-steel fire tube technology from the NFB series released in 2018. The commercial fire tube boiler features a 15:1 turndown ratio, 91.7 percent thermal efficiency, BACnet or LonWorks to BMS communication capability and top and bottom water piping connections.