Why we love this product.

  • Revolutionary fire tube technology
  • High efficiency
  • Versatile venting options
  • Built-in powered connections
  • Easy installation


Navien NFB-175H Condensing Boiler uses a revolutionary advancement in fire tube boiler technology to ensure maximum compactness, efficiency, and reliability. The NFB-175H features a patented stainless steel fire tube heat exchanger, completely reimagining fire tube technology for enhanced performance and durability. NFB-175H delivers world-class quality and comfort to homes and businesses.

NFB-175H Features

  • High Efficiency: With its condensing heating boiler design, the NFB-175H achieves remarkable energy efficiency, boasting a 95% AFUE (Energy Star certified) rating.
  • Versatile Venting: The boiler offers flexible venting options, allowing for 2″ venting up to 65′ and 3″ venting up to 150′, providing installation flexibility and convenience.
  • Advanced Controls: Equipped with advanced controls and an intuitive user interface, the NFB-175H ensures easy operation. The included Setup Wizard simplifies the initial configuration process.
  • Zone Control Ready: Built-in powered connections cater to up to 3 zone valves or 3 zone pumps, enabling efficient and customizable heating in different areas.
  • Scalability: The NFB-175H supports common venting for up to 8 units, streamlining installation for larger projects. Cascading capability allows connection of up to 16 units, ensuring optimal performance in commercial settings.
  • High Altitude Approved: This boiler is approved for use at high altitudes up to 10,100 ft. (NG and LP), and conversion kits are included to facilitate adaptation.
  • Durable Construction: The NFB-175H features a patented stainless steel fire tube heat exchanger, ensuring longevity and efficiency. Its non-metallic condensate base helps prevent corrosion and enhance overall performance.

Experience the future of fire tube boiler technology with the Navien NFB-175H Condensing Boiler. Trust our expertise and enjoy the benefits of superior comfort, energy efficiency, and reliability in your home or business.