you may wish to check this thread.
The important thing to make sure you have an expansion tank installed if you have a conventional hot water tank.
Some news, the other day I noticed the alert LED was blinking 5 times, I only happened to noticed it when I was near the unit, but turns out it was warning me that my water temperature was cold (i.e. below 39F). It was probably happening all winter, here’s my water temperature data for the month of March, you’ll see the temperature dip below 39F when there is a large amount of water being used
This is pretty cool, but it would have been nice to get a notification on my phone…but perhaps it might get to annoying in the colder climates…