Navien NCB Gas Boilers
Review and Buying Tips

Navien gas combi boilers from the NCB series, as the most advanced boilers from this manufacturer, are designed for efficient potable water and space heating, which includes hydronic, radiant floor, and air handlers.

Check out the best features, advantages, and benefits for the homeowners.

Navien NCB boiler

Features and benefits

Condensing technology

Navien NCB models utilize on-demand or tankless, and condensing technology resulting in continuous water heating with ultra-high energy efficiency for significant savings and low environmental impact.

There are three powerful models available for homeowners; NCB-180, NCB-210, and NCB-240, all designed for residential applications and whole-house use, but only in closed-loop heating systems.

Built with condensing technology, these Navien models come not only with one but three heat exchangers, all made of durable stainless steel, resistant to corrosion, and covered with a 10-year warranty against leaking.

Easy and worry free installation

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With the approximate size of 17” x 28” x 12” and the maximum weight of up to 84 pounds, Navien NCB boilers are ideal for the wall mount, either in new or old systems (as the retrofit), easily replacing the standard tank-type models, and saving the floor space for other use.

Also, due to the forced draft direct vent design and its sealed combustion chamber, these boilers can be safely installed inside the house while using the outside air for combustion.

Multi-purpose design

The multi-purpose design of the Navien NCB models provides enough heat for larger homes while supplying hot water for up to three applications simultaneously, even more if the cascade link is used. This cascade capability allows up to 15 condensing boilers to be linked into one system.

Similar tankless and condensing models:

Strong burner

Navien NCB boilers are equipped with powerful and environment-friendly premix gas burners, which have the maximum gas inputs of 150,000 BTU, 180,000 BTU, and 199,900 BTU (depending on the model) including the option for modulation, which further reduces the power to its minimum power of 14,000 BTU.

Such quality and gas-saving burners, with condensing technology and recycled exhaust gases, are resulting in a significant reduction in pollution and a considerable increase of the energy factor to the value of 0.99.

Flexible venting

Due to condensing technology, products of combustion have a lower exhaust temperature so that the unit can use PVC, CPVC, and PP venting, which results in lower costs, faster and easier installation than the stainless steel vents found on conventional tankless water heaters.

The maximum vent length is up to 150’, with the 2” and 3” in diameter and using a two-pipe configuration. The vent termination can be horizontal and vertical through the roof, providing more installation flexibility.

Useful built-in features

NCB models are factory-built to use natural gas but can also be converted to use LP (propane) gas due to the installed dual venture system and low gas pressure operation. The Navien gas conversion kit is supplied with the boiler (it also includes the orifice for easy field conversion).

The NCB models also come with a built-in domestic hot water flow restrictor. Still, if further flow restriction is needed, three different ones are also provided for different water flow rates.

Control panel

Other advanced features include the gas flow control system that helps in reducing the energy waste and unnecessary unit operation, a computerized control panel that provides the necessary information, allows easy temperature change, and displays the error diagnostics.

The control panel allows the temperature change from 86 F to 140 F in DHW mode and from 77 F to 194 F in hydronic heating mode. The electronic board as the “brain” of the boiler ensures safe and reliable operation, constantly “watching” operating parameters and protective elements such as different temperature, pressure, and operating sensors, for safety.


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