Description
The NFB-H Series offers premium features and advantages:
A - Venting options include 2" for distances up to 65' and 3" for up to 150' (inclusive of schedule 40 PVC). The Vent Installation Detector (VID) enhances safety.
B - Utilizes a Dual Venturi system for improved combustion control, turndown ratio, and convenient field gas conversions.
C - Features a patented stainless steel fire tube heat exchanger with Navien's innovative design, certified by ASME, "H" Stamped, which reduces common high-stress point weld failures found in other combi-boilers.
D - Operates efficiently even at low gas pressures. A negative pressure regulating gas valve guarantees optimal performance down to 3.5" of water column for natural gas and 8" of water column for propane gas.
E - Boasts an advanced user interface with a Setup Wizard that simplifies operation through a backlit panel, click-wheel control, and intuitive text.
F - Includes built-in control for a boiler pump, 3 zone pumps, or 3 zone valves, enhancing system flexibility and control.