Well I went to Aqua Hots website and went to the various model breakdowns and I could find NO reference to small heated tubing that would run under the floors. IF Entegra is doing that(running small heated tubes with Propylene Glycol) under the tile floors, sorry, I would NOT like that type of system. The chance of a tube getting a leak and then you would have a mess, because there is NO EASY way to gain access to repair that type leak, and the fact you would have warm/hot water injected under the tile and then that antifreeze would then saturate your storage area before you would be aware of the leak. The Aqua Hot website shows their standard radiator/muffin fan system and states "heated floors" from that system. Entegra's website does not have any additional info. If they do indeed run tubing I stand corrected. Doug
PS, 120 heated floor grids are NOT embedded in the tile. It is layed down flat and then the Tile mastic is applied and the tiles then installed on top. It does NOT take hours to warm the floor. About 30 minutes to get a warm feeling and then about another 30 minutes to get to temps above 95 degrees.