Navien tankless water heaters from NR (A) series: NR-180, NR-210, and NR-240 are ultra-efficiency units that utilize condensing technology for continuous, on-demand potable water and space heating. This review covers two types, NR-A with the recirculation feature and NR that is without.
The Navien manufacturer offers three sizes of tankless water heaters for residential applications, either talking about NR or NR-A series; NR-180 and NR-180A, NR-210 and NR-210A, NR-240 and NR-240A.
With the use of the modulating gas burner, Navien water heaters can work in the power range from the minimum of 15,000 BTU to a maximum of 199,900 BTU/hr and provide the maximum flow rate of 11 GPM, which is ideal for larger homes with more than three bathrooms. There is a cascading arrangement for high-demanding homes that combines water heaters into one system, either NR-A or NR models.
The Navien NR-A series is the same as the "non-A" group, but with the addition of the circulation pump and mini-buffer tank. NR-A models can be used for both domestic hot water and space heating, while the NR is just for potable water.
If you have ever experienced "cold-water sandwiching" during the shower or couldn't get a trickle of warm water, the "A" series is a water heater model you should look for. Thanks to the ComfortFlow technology, the heaters do not require a minimum flow rate to operate, and water temperature fluctuation is minimized. NR models are not equipped with the circulation pump but can utilize the external pump, provide recirculation, and connect to the storage tank.
|Models / Specs||NR-180(A)||NR-210(A)||NR-240(A)|
|Gas input (BTU)||15,000-150,000||17,000-180,000||17,000-199,000|
|Water flow (GPM)
(@30 F temp.rise)
|Temp. settings (F)||98-140||98-140||98-140|
|Energy consumption (Watts)||200||200||200|
|Max. vent length (ft)||100||100||100|
As you can see from the above, Navien tankless water heaters from the NR and NR-A series are solid units that provide great benefits to its users; endless and on-demand hot water supply, comfortable showers, inexpensive venting, eco-friendly solution, space-saving design, long warranty, quality, low operating costs, and much more.