Hah, these magic-heater ads seems to be more common than I thought. In another comment in this thread, I just linked to a different one (in German):

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

Yours is much more interesting though.

Here's Big Clive doing a teardown on the device in your video: https://www.youtube.com/watch?v=sPnLnk35XsY