Navien NPE-A Water Heaters Review

Models NPE-180A, NPE-210A and NPE-240A from Korean manufacturer Navien are ultra-efficient water heaters, made for on-demand heating of potable water in residential and light commercial applications, and also for space heating. Below is the review of the specs and main features you need for buying any of the three available models.

navien npe water heater series

All models from Navien NPE-A group are equipped with the ComfortFlow technology, a technology that reduces the wait time for hot water between the heat exchanger and hot water tap, eliminates the minimum flow rate requirement and reduces the temperature fluctuation.

This is what increases the overall experience and saves you money. NPE-A models are equipped with the recirculation pump and 0.4 gallons buffer tank, which ensures fast delivery of hot water and reduced number of "cold water sandwiches". By setting up the DIP switch, you can arrange any model to use the internal or external recirculation mode.

As opposed to other two groups of Navien tankless water heaters, CH and NR models, NPE-A models have the factory built-in temperature controller with the LD display, conveniently located at the front of the unit (see the picture). The controller allows you to adjust and monitor the temperature of hot water, check the operating status and potential error codes.

The features that are part of the control panel are: hot water recirculation mode, diagnostic button, master button for cascade operation, button for basic information, power and reset button, up and down button to increase and decrease the temperature and status light. By using the up and down push buttons the temperature can be set in 1 F increment, in the range from 98 F to maximum 140 F, while for NPE-240A and space heating up to 185 F. A remote controller can also be installed, but it is an optional accessory.

Every unit must be properly vented to ensure the constant flow of fresh air for combustion and removal of the products of combustion. For the proper work of the venting system, NPE uses the 2" PVC, PP, ABS or CPVC venting pipes with the maximum length of 60 ft, and if the 3" pipe is used, up to 150 ft.

Another great advantage of the Navien water heaters from NPE series is the built-in control feature for multi-unit system so no extra elements and features are needed for cascading units into one system. Up to 16 units can be connected via Navien Ready-Link communication cable, if demand for hot water is high.

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Features review

  • Primary and secondary heat exchangers, made of stainless steel for reliable and long lasting work.

  • Indoor and outdoor installation where the indoor model uses the direct vent sealed combustion.

  • Built-in control panel for temperature adjustment and error code display.

  • Cascading set-up for connecting up to 16 units.

  • Built-in pump and buffer tank for internal and external recirculation.

  • All Navien NPE-A are factory built to use natural gas and convert to use propane gas.
  • Safety features: Flame Rod, APS, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High Limit
    Sensor, Power Surge Fuse. The freeze protection uses the recirculation mode to protect the unit.


NPE-180A NPE-210A NPE-240A
15,000-150,000 19,900-180,000 19,900-199,000
Water Flow
(GPM) @ 35 F rise
8.4 10.1 11.2
Energy Factor
0.95-0.97 0.95-0.97
Min. Water Flow
0 0 0
Activation rate
0 0 0
Temp. settings
98-140 98-140 98-140
Electric consumption
200 200 200
Max. vent length
100 100 100
75 82 82

Navien tankless and condensing water heaters from NPE-A series are powerful and versatile units that can last for many years (approximately 20 years), as long as properly maintained and serviced on time.

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