NCB-E & NFC Series


Supporting your green building reputation

Professionals can now recommend a single solution for both DHW and whole house space heating comfort.

Navien combi-boilers are the first true all-in-one condensing tankless water heater and boiler system that has the capacity to heat a large house and provide all the DHW for the whole family. Now you can design, specify or install one unit with two capacities, saving space, energy and water.

Innovations make Navien condensing combi-boilers the best choice for everyone

  • Separate heat exchanger for domestic hot water
    creates one of the highest flow rates in the industry.
  • Energy efficient — 95% AFUE.
  • Energy Star certified.
  • Backed by one of the industry’s strongest warranty — heat exchangers (10 years residential / 5 years commercial).
  • Space saving design.
  • Can be cascaded with Navien NPE water heaters
    for increased DHW flow demand.
  • Easy to use control panels.
  • Elegant, clean appearance.
  • Ideal for replacements or new construction.
  • Optional NaviLink™ remote control system.
  • NaviClean™ magnetic filtration system
    (Included NFC / optional NCB-E)

Space saving design occupies 80% less space than a traditional floor standing boiler and tank water heater.


Navien combi-boilers... a great choice for small or large homes and businesses

  • Stainless steel heat exchanger

    Navien’s advanced stainless steel heat exchanger design resists corrosion better than copper for longer life.

  • High flow rates

    Separate stainless steel flat plate heat exchanger for DHW creates one of the highest flow rate for any combi‑boiler in the industry. (NFC up to 5.4 GPM @ 67º temperature rise; NCB-E up to 4.5 GPM @ 77º temperature rise).

  • Optional NaviLink™ Wi-Fi
    control system

    The NaviLink™ Wi-Fi control system provides access to
    NCB-E and NFC condensing combi-boilers from anywhere in the world.

  • Multiple venting options

    Low exhaust gas temperatures allow use of PVC, CPVC, polypropylene (rigid and flexible) and stainless steel venting reducing installation time and costs. System can use 2"
    venting for up to 60', or up to 150' with 3" venting.

  • Low noise levels

    Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running Navien combi-boilers.

  • High turndown ratios

    The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW. (NFC TDR 11:1 for heating and DHW; NCB-E TDR 6:1 heating, 11:1 DHW)

Protect the environment as you add value


Navien condensing stainless steel heat exchangers recover additional heat from the flue gases contributing to reduced energy consumption and lower CO2 emissions. Resulting lower exhaust temperatures allow for the use of inexpensive venting materials such as PVC Schedule 40 in almost all applications.