Unlimited hot water (electric)

I have also been looking at these for a while and concluded electric is not possible for us. At this point I am waiting for the Truma AquaGo to set up their dealer network so I can have it installed/serviced within a reasonable distance. I got a chance to talk to one of their beta testers who states that it works perfectly for him (does not run out of hot water and the water temp does not fluctuate). The person I talked to is in the last video and is wearing the baseball hat. Here are links to videos on them and a link to the webpage:

http://www.truma.net/us/en/water-systems/aquago.php

https://www.youtube.com/watch?v=T835aYtjS7o

https://www.youtube.com/watch?v=OUjoK0WgsGQ