The NFB-C series High Efficiency Condensing Fire Tube Boiler is the #1 choice for commercial applications. Features include:

• Lower installation costs with an engineered compact wall hung design, intuitive controls, top or bottom piping connections, and flexible venting options
• Lower operating costs with the industry's leading thermal efficiency at TE 97.5% - Energy Star approved
• Cascading and common vent capable
• Low exhaust gas temperatures allow the use of PVC, CPVC, Polypropylene, and Stainless Steel venting, reducing installation time and costs.
• System can use 3" venting for up to 60 feet, or 4" venting for up to 150 feet
• BMS connectivity (Modbus, BACnet and LonWorks
• Dual venturi system creates better combustion control and turndown ratio
• All units come with field orifice conversion kits for propane gas use
• Easy access heavy-duty air intake filter
• Negative pressure regulating gas valve ensures maximum performance all the way down to 3.5"wc on natural gas and 8"wc on propane gas
• Advanced 7" touch screen controls with built-in USB port to export boiler data and download software updates