NCB-E Series

Condensing Combi-Boilers

The only compact combi-boiler strong enough to support DHW and heating for the whole house

Navien NCB-E is the first high efficiency condensing combination boiler with the capacity to supply both heat and domestic hot water for larger homes — enough hydronic heat for a whole house, plus hot water to run two showers and a dishwasher all at the same time.







  • The highest energy efficiency in the industry—up to 95.0% AFUE
  • Energy Star certified
  • Backed by the industry’s strongest warranty—10 years on heat exchangers
  • Takes about 80% less space than floor standing boiler and tank water heater
  • Can be cascaded with Navien NPE water heater for extraordinarily large demand
  • Easy to use control panel
  • Elegant, clean appearance
  • Ideal for replacements or new construction

NCB-E Applications

  • Air handler
  • Hydronic heating
  • Hydronic fan coil
  • Baseboard radiator
  • Radiant floor

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

  • Dual stainless steel heat exchangers last longer than copper

  • Condensing technology reduces energy consumption and greenhouse gas emissions

  • Optional NaviLink™ Wi-Fi control system gives you access to your Navien systems from anywhere in the world

Protect the environment as you add value

Navien primary condensing stainless steel heat exchangers recover extra heat that would be lost in non-condensing tankless heaters to reduce energy consumption and CO₂ emissions. That keeps exhaust temperatures very low — so low that economical Schedule 40 PVC pipe can be used for venting in almost all applications.

The ultimate in energy efficiency

Navien condensing combi-boiler technology provides up to 95.0% AFUE, recognized by Energy Star as Most Efficient. These extremely efficient and eco-friendly units provide extra energy savings over a traditional floor standing boiler and storage tank.

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