apparently it works, ive fitted some but never felt it while on

thing is, its never going to be that good because ceramics are very good insulators of heat.

dnt bother putting self leveller on either, just lay the tiles ontop of the, aslong as the floors primed with pva or similar, then the matting is layed, and another layer of primer ontop of the matting, itll be fine. the leveller will just insulate it even more.