Just watched the latest video, very cool.
So the heated floor comprises a copper plate inside the individual tiles that are all connected and powered by electric current I take it? If that is so, then way cool.
My friend did the “radiator” type of heating which is gas powered and coupled with the water heater. To install, they had to basically carve out lines in all the walls to run the pipe and that ultimately emerges from the walls of each room as a radiator element. Watching them drill the living crap out of all of the walls made me cringe so I passed.
Your system is absolutely brilliant in its conception and what appears to be a non-intrusive installation (when compared to above); great decision on your part mate.