In regard to (tile) radiant floor heating, a professional is needed to come and install a heat-conducting plastic mat with wire lattice-work, hook it up to the home’s electrical system, and then do the standard grout and tile work etc. I was wondering what the possibility would be to produce tiles that are cut in a way so that they would fit together like a puzzle that have the resistance wires already imbedded. This way, the homeowner could install the system himself by laying down precut tile and only have to worry about properly connecting the wires to the home’s electrical system. Perhaps some type of dimmer switch could act as a thermostat. It seems as though the tile would not retain heat long enough to be proficient without some type of “thermal mass” (is this the correct term?). Do you have any idea if this method would be terribly inefficient without it? Perhaps the same type of polymer without the wires insidencould be cut into lengths in the store and applied at home, underneath the grouting the tiles on top in order to solve this problem. Please let me know if you see anything wrong with this approach. My main issue is how the wires in each tile would connect to one-another in a waterproof fashion. Is there some type of alternative substance that could replace the ceramic tiles in order to retain heat longer? Sorry for the long explanation/question and thank in advance for all of the help.