Discover Navien tankless and condensing water heaters from the NPE series with the standard and advanced groups of heaters made for on-demand heating of potable water in residential and light commercial applications, including space heating. Check out the main differences between NPE-A and NPE-S models and which is a better buy.
The Navien NPE series comprises two types of tankless and condensing water heaters; NPE-A as the advanced and NPE-S as the standard type. NPE-A has three models to choose from; NPE-180, NPE-210, and NPE-240, while the NPE-S group includes one more, NPE-150S, as the smallest unit in this group.
Official site: Navien
All models coming from the 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. The ComfortFlow technology of the NPE-A models incorporates the recirculation pump and 0.4 gallons buffer tank, ensuring fast delivery of hot water and reducing the number of "cold water sandwich" effects. By setting up the DIP switch, you can arrange any model to use the internal or external recirculation mode.
In front of the Navien NPE water heaters is the control panel that includes features such as hot water recirculation mode, diagnostic button, a master button for cascade operation, a button for basic information, power and reset button, up and down button to increase and decrease the temperature and status light.
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 NPE-240A and space heating up to 185 F. A remote controller can also be installed, but it is an optional accessory.
Both groups are equipped with two stainless steel heat exchangers, made to heat water fast, efficiently, and for many years.
NPE-A models have an energy factor of up to 0.97, while the NPE-S has a maximum EF of 0.99. This ensures excellent energy savings as it can heat water more efficiently and with less power than the non-condensing units.
Every unit must be adequately 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 NPE water heaters is the built-in control feature for the 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.
The NPE series are made for water heating and combined space / DHW application. An add-on controller allows NPE-A models and hydronic air handlers to work together, utilizing the pump to circulate hot water.
Another useful add-on feature is the Wi-Fi remote control system, which allows users with the smartphone to remotely control water temperature, check the status, and if there is a malfunction - receive diagnostic error codes.
|Models / Specs||NPE-150S||NPE-180A/S||NPE-210A/S||NPE-240A/S|
|Gas input (BTU)||18,000-120,000||15,000-150,000||19,900-180,000||19,900-199,900|
|Water flow (GPM)
(@35 F temp.rise)
|Temp. settings (F)||98-140||98-140||98-140||98-140|
|Energy consumption (Watts)||200||200||200||200|
|Max. vent length (ft)||2" - up to 60||2" - up to 60||2" - up to 60||2" - up to 60|
|Size (inch)||17.3 x 27.4 x 13.2|
Navien tankless and condensing water heaters from the NPE series are powerful and versatile units that can last for many years (approximately 20 years) and be properly maintained and serviced on time. The manufacturer provides a warranty of 15 years in residential applications and 8 in the commercial on the heat exchanger.