Q on electric ufh ...

[morqthana]

And what I didn't know, until I looked at them in more detail (and so the same could apply to anybody) that Amtico, and presumably competitors, do thin (few mm) strips you lay alongside the tiles, which looks like grouting.

 

[JohnW2]

The human body is about 37 degrees so any floor will feel, to a degree cold.

Indeed so - unless, of course, the floor is also at least 37 degrees.