The app is good and what it does but there is so much more that could be built it. Instead of just scheduling the circulate pump, why not have a way to schedule different outflow temperatures as well. Morning may desire higher for showers and middle of the day less. I know it is only heating up a small volume of water at a time for the circulation pump but if it is going to run all day why not have a 100 degrees during the day and then when home is occupied it could be 120+ as desired.

I install the NaviLink in the same week of the new heater and it has been working like a charm for the past year. While the hardware may sounds a little expensive, it enables mobile app operations and remote access of all key features of the heater including setup temperature or scheduling heat cycles and others. More importantly it offers the glimpse of your system usage, energy consumption, and your heating habits. You can see how much gas you used and how much water it processed by day, month, and year. The scheduling part needs a little trial and practice. But once done you don’t need to touch it. Overall it is an excellent value for your modern heater.

The app won’t open on the iPhone Duo (immediately crashes and closes out), despite deleting the app and reinstalling it. Works fine on my older iPhone 13, and the iPhone 17 Pro Max I just traded in. Also, I really wish Navien would allow schedules to be set AND a hot button feature with in the app to co-exist. There are a few small windows of time each day that I KNOW I’ll need hot water, but also several random times in between scheduled windows that I need hot water (i.e., washing my hands after using the restroom). Seems like a waste of energy to set a longer schedule throughout the day/evening to cover time I “might” need hot water for 30 seconds.

When traveling I start the dishwasher and can shut down the tankless remotely after the cycle completes. I feel that the low cost of the WiFi connection has paid for itself.