Navien NPE-S2

    Navien NPE-S2 Standard


    When it comes to water heater performance it’s all about the output of hot water produced. The Navien NPE-S2 condensing tankless water heaters are so efficient that they can outperform much larger capacity non-condensing competitors. More output for the money, lower installation costs, and lower operating costs for customers making it the best choice for your tankless water heating option.

    NPE-S2 or the NPE-A2?

    What is the difference between the two? The S stands for STANDARD and the A stands for ADVANCED

    Fundamentally they are very similar, the NPE-A2 offers a few additional features that are absent on the NPE-S2. If you are looking for a tankless to provide hot water and that is all than the NPE-S2 is likely your best choice. If you want to a recirculation line, or possibly home heating in addition to hot water than the NPE-A2 is probably your best choice.

    the new navien npe-s2

    The new Navien NPE-S2 series are the most innovative condensing tankless water heaters on the market today. These tankless water heaters deliver a continuous flow of hot water for as long as you need it. There’s no waiting for a storage tank to warm up. A few of the new features are listed below.

    A – 2″ PVC up to 75 feet and 1/2″ gas up to 24 feet

    B – High efficiency up to 0.95 UEF and up to 15:1 TDR

    C – Durable dual stainless steel heat exchangers

    D – EZNav multi-line control with built-in intuitive software

    The new NPE-S2 doesn’t have a built in re-circulation system like the Navien NPE-A2 does but it is an an external option if you do decide that it is something you might want or need in the future. A re-circulation pump and NPE-S2 could also be used for small radiant heating applications. Examples could be for something like bathroom floors, towel heaters, or maybe small room space heating. If one of the features above is something you can see yourself adding in your home it might be better to jump up to the NPE-A2 and have everything built right into the system.

    Navien NPE-S2 control panel

    Multi-line control with built-in intuitive software! 

    Navien’s new backlit EZNav control panel uses simple text and icons to make set up, operation status, and troubleshooting faster and easier than ever before. Your Navien control center is now more intuitive than it has even been before.

    • Self-diagnostics.
    • Displays temperature and water flow rate.
    • Displays status of cascade operation.
    • Convertible display from °F to °C.
    • User Friendly Interface.
    • Easy setup.

    Navien NPE-S2 Models

    Navien NPE-S2 models


    • Max Input: 150,000 BTU/H
    • Indoor or outdoor wall-hung
    • Residential/Commercial


    • Max Input: 180,000 BTU/H
    • Indoor or outdoor wall-hung
    • Residential/Commercial


    • Max Input: 199,000 BTU/H
    • Indoor or outdoor wall-hung
    • Residential/Commercial

    The Navien NPE-S2 comes in 4 different sizes, from 120,000 btu to 199,000 btu. For all of Canada we don’t recommend that you install anything less than the NPE-180S2 as the incoming water during winter can be too cold and really reduce hot water production. Outdoor models are also almost exclusively used in climates that rarely experience sub zero temperatures. Of course there are exceptions and occasionally a situation arises where an smaller unit or an outdoor one makes sense and can be installed.

    Re-circulation valve with Navien NPE-S2 Tankless Water Heaters.

    Recirculation capabilities on a Navien NPE-S2

    This unique vale is designed for re-circulation of domestic hot water in applications where a dedicated return line is not available. Navien calls this system their “NaviCirc”. It is a fairly simple plumbing device that uses the existing hot and cold water lines already installed throughout your home to reduce the wait time for hot water at the faucet without the need for a dedicated re-circulation return line.

    1. Can be used with NPE-S2 Series tankless water heaters.
    2. Automatically blocks circulation when the hot water temperature within the valve is about 95°F (35°C)
    Optional Wi-Fi remote control system

    The NaviLink module makes it easy to communicate with your Navien systems anywhere internet service is accessible. It easily connects to any new or existing* Navien NPE series tankless water heater, NCB-E series combi-boiler,  NHB series and NFB series boiler. Once installed, simply download the free app on your smartphone or tablet. Then you will be able to turn your unit on or off, change the water temperature, monitor system status and even activate the re-circulation system on your NPE-S or NPE-S2 tankless water heater with an installed HotButton Kit.

    So you can relax… with internet connectivity to your tankless, combi-boiler, or any Navien system you will have the convenience and control of all your systems right in the palm of your hand.

    *Tankless systems already installed may require the purchase of a new main PCB and front control panel.