Patented compact stainless steel fire tube heat exchanger
Navien’s advanced patented stainless steel heat exchanger design is ASME‑Certified, “H” Stamped, and reduces high stress point weld failures common on other boilers. This compact, in‑house designed and manufactured heat exchanger uses the latest automated laser welding technology to deliver superior product quality.
- NFB 175 : 17,500 – 175,000 BTU/H
- NFB 200 : 19,900 – 199,000 BTU/H
- Patented stainless steel heat exchanger —eliminates high stress point welds.
- Advanced user interface and controls with intuitive text display, simplifies boiler setup.
- Built-in hardware to connect a boiler system pump, 3 zone pumps or 3 zone valves.
- Optional NaviLink Wi-Fi remote control.
- Cascading and common venting capable.
- 10:1 Turn Down Ratio.
- AFUE 95.0% — Energy Star 2018 most efficient rating.
- Advanced user interface and controls
- Built-in hardware to connect a boiler pump, 3 zone pumps or 3 zone valves
- NFB Manifold Kits