Plumbers and HVAC guys hate them. Trying to find one to work on them is a challenge.

So far the unit has worked, but one thing I was advised early on was that it has to be used. If they shut down and don't get used for a period of time, that is when issues come about. It might save you $ on the front end, but it could cost you more on the back end. I was actually going to take my tankless and have it moved from the spare building to our main house. I brought out 3 different companies and all of them told me it was a bad idea. They said with how efficient the tanks are nowadays, I wouldn't see any savings.