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Compare Navien Water Heaters

Navien condensing heaters can be found in three sizes comprised in two categories; NR and NPE series, where NR series is designed for the hydronic and domestic hot water heating, while NPE is just for water heating. NR series has also two subcategories such as those shown below.

Navien NR-180 and NR-180A
Navien NR-180 and NR-180A are capable of heating water with the maximum water flow of 8.3 GPM, which is enough to supply up to four fixtures, working at the same time. Modulating gas valve allows Navien NR-180 and NR-180A to work in the range from 15,000 to 150,000 Btu and provide energy efficiency from 0.94 to 0.97.

Navien NR-240 and NR240A
Maximum water flow of 11 GPM allows Navien NR-240 to be the right pick where supplying hot water with up to five fixtures is needed. This is the most powerful unit from all Navien tankless water heaters and is built for residential and commercial water heating; it's max. gas input is 199,000 Btu and maximum temperature it can achieve is 185 F.

Navien NR-210 and NR-210A
Navien NR-210 with the maximum water flow of 10 GPM is used for heating water in residential homes and supply up to four fixtures simultaneously. This water heater comes with the maximum gas input of 180,000 Btu and thanks to the modulation it can lower its power to approximately 17,000 Btu.

NR Comparison


NR-180 /
NR-180A
NR-210 /
NR-210A
NR-240 /
NR-240A
Gas Input
(Btu/hr)
15,000-150,000 17,000-180,000 17,000-199,900
Water Flow
(GPM)
8.3 10 11
EF 0.96-0.97 /
0.94
0.95-0.97 /
0.94
0.95-0.97 /
0.95
Weight
(Lb)
67 /
77
77 / 
86
77 / 
86
Min. Flow 
Rate GPM
0.5 /
No minimum
Gas connection 3/4" NPT


Navien NPE Series
Navien NPE series are uniques no 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.
Another difference from the above NR series is that NPE water heaters are using 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.

NPE Comparison


NPE-180A NPE-210A  NPE-240A
Gas Input
(Btu/hr)
15,000-150,000 19,900-180,000 19,900-199,900
Water Flow
(GPM), 35 F
8.4 10.1 11.2
EF 0.95/0.96 0.95 / 0.97 0.95 / 0.97
Weight
(Lb)
75 82 82
Min. Flow 
Rate GPM
0
Gas connection 1/2"


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 NR-"A" and NPE models. This is known as the ComfortFlow Technology so no minimum water flow rate is required anymore.