Don't be put off by some of the experiences people have had with heated floors.
NuHeat is an excellent start. They make a quality mat and we have used them many times over with great success. They are not the cheapest, but the quality is there. Why would you want to risk ripping up a tile floor to save a few bucks on a cheaper mat?
Their customer service is second to none. Look up a rep in your area. If he is anything like the one in our area, he will come to the job and take exact measurements and recommend the proper mat for the installation all at no charge.
If you do enough installs, when, not if, when a floor mat gets damaged, NuHeat also have the tools and expertise to find the *exact* spot where the damage is so that any tiles removed are minimal. Many times only ONE tile needs to be removed and the proper repair made.
Our rep has helped us solve 2 of these problems for no charge, leaving another satisfied and impressed homeowner, and reinforcing our belief in using NuHeat products.
You can't pay for better customer relations and service.