Oh, that's not at all what I thought it was. That's that floor heating system. My uncle was going to put that in his house when he built, but changed his mind for some reason.
Yeah, that is something that would interest me, but it obviously requires major installation work and I wonder how they would manage the second floor.
This would be an ideal thing to do when you're building a new house or are doing major renovations, but I think it would be out of our budget.
Thanks for the info, Osso. My uncle was describing this thing to me and it was cool to actually see the set up :-)