Navien Tankless Water Heaters Review

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The review of Navien tankless water heaters shows all the superb features that make these units amazing. All Navien models are condensing, and the energy efficiency can reach great 98%. There are no other tankless heaters that can achieve that.

This is why Navien is a popular and wanted brand. Tankless and condensing technology, followed by the superior features provides high efficiency water heating and other great benefits such as the lower energy consumption and operating costs, reliability, lower pollution and extreme comfort.

Navien Model Selection

Navien condensing heaters can be found in several sizes and three categories; NCB, NHB and NPE series, where the NCB series is designed as the gas combination boiler, NHB as the gas heating boiler and NPE as the tankless heater for water heating only, all providing ultra high energy efficiency of over 90%.

Navien NCB Series

Navien NCB Gas Boilers Series

Navien gas boilers from NCB series are available in four sizes; NCB-150E, NCB-180E, NCB-210E and NCB-240E, all designed with the advance technology and for the whole-house use - both heating and domestic hot water production.

All NCB gas boilers are covered with the 10-year warranty against heat exchanger leaking and due to the quality elements can last very long, at least 20 years.

Navien NHB Series

navien nr series

Navien condensing boilers from the NHB series, with the maximum size of 24” x 17” x 13” and with the lower power output, are the smallest units from this manufacturer, designed for the efficient potable water and hydronic heating, in small and indoor residential and light commercial applications. One of the highest Turn Down Ratio is found here.

Navien NPE Series

navien NPE series

Navien NPE models are unique not only because of its high energy efficiency, but because they can utilize home's 1/2" gas line and can be easily converted from using the natural gas to propane in both indoor and outdoor applications.

NPE series of tankless water heaters utilize the Front Panel Command Centre for easy set up, troubleshooting and monitoring of the essential parameters. And with the Intelligent Preheating Technology, showers are much more comfortable since the system recognizes your hot water usage pattern. Navien tankless water heaters from NPE series come with the 15 years warranty.

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Top Features

High quality heat exchangers

Navien tankless water heaters are unique because of its ultra-efficient water heating in two stainless steel heat exchangers. There is no other manufacturer that offers that. Most of the other brands have one SS heat exchanger and the other (primary) made of copper.

Thanks to its design, Navien heater is fully protected from the acidic environment and its destructive action on the main components. The condensing technology uses the energy from the exhaust gases, therefore, lowering the temperature of the flue gases. As the water heater delivers the cooled exhaust gases, Navien recommends plastic PVC venting, which is not only easier to install, but cheaper.

Optimal gas combustion

For the optimal gas combustion even where the longer vent pipes are needed or working under different air pressure, Navien tankless water heaters utilize two sensors, APS (Air Pressure Sensor) and GPS (Gas Pressure Sensor), which are controlling the air / gas pressure and fan speed.

Low NOx gas burning

As most of the tankless water heaters on the market, Navien hot water heaters utilize the Eco Pre-mixed burner which lowers the emission of NOx gases. The burner has three stages, from partially to the fully lit burner. Gas combustion in the heater's burner is controlled by the microprocessor for the best performance. Actually, there are two microprocessors, responsible for certain operation inside the heater, so the result is better and more reliable water heating.

Instantaneous heating and supply

Another great thing about Navien is that they can provide hot water instantaneously, by applying the pump and mini buffer tank into their tankless design. These two features are found on all NPE-A models. This is known as the ComfortFlow Technology so no minimum water flow rate is required anymore.

Flow rate

If any of these models cannot meet the requested demand for hot water, Navien recommends the Ready-Link Cascading System to link up to 16 units into one system with no complicate wiring and venting. Such a set up is ideal for larger applications in hotels, restaurants, schools... as every Navien has the built-in controls that allows easy setting.

Remote control

For the end, the remote control, NR-10DU comes with every tankless package. The remote control is not only convenient to use and change the temperature, but it is also smart to provide info about problems through the error codes.


As seen from the above, Navien tankless water heaters have great benefits and many advantages over other manufacturers. Two stainless steel heat exchangers, high safety, ultra-condensing efficiency and the highest EF in the industry, buffer tank option for reduced "cold-water sandwiches", are some of the reasons why Navien should be your choice when looking for the best tankless water heater.

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What Other Visitors Have Said

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Complete Waste of Money 
We purchased a Navien 240A recirculating propane heater. From day one, we have had nothing but problems. We waste more water waiting for hot water than …

Navien issues 
I purchased a Navien Tankless Water heater 7 years ago. I have had problems with the unit as the water turns cool after about 2 minutes in the shower. …

What they don't tell you Not rated yet
Navien NPE has been installed for a couple weeks. It's OK, but water pressure drops some 20% due to "that's how it works." Although they don't tell you …

Be ware of over heating on Navien Combi units. Not rated yet
I am a licensed master plumber and have just finished the install of a Navien 240 NCB. This unit serves a residential home with hot water baseboard heat. …

Navien CR-210 Not rated yet
Install my Navien CR-210 98% condensing tankless water heater in 2010, its never failed. I do regret not getting the Navien CR-210A with the circulation …

Displeased navien owner Not rated yet
Purchased Navien 8-26-15. Exactly one year later entire basement flooded due to a malfunction in unit. The guy that put it in, came back, Navien refused …

Very impressed with my Navien NPE-240A Not rated yet
I am very impressed with my Navien tankless water heater. I recently had the NPE-240A installed. It is easily one of the most efficient on the market. …

Navien review Not rated yet
I had a Navien on demand in line hot water heater installed about 4 years ago; it's a piece of junk. Run away from this brand. One plastic elbow failed …

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