A few observations about installing a thermostat in a heated tile floor after having been through the experience.
1. Purchase and install a redundant thermostat. Run the lead and position the thermostat in a different part of the floor than the primary.
2. The tip of the thermostat is somewhat large and may impact the tile height. If the tip appears larger than the expected depth of the thinset, notch out a pocket in the underlayment into which the thermostat will rest
3. Position the thermostat away from any heat source, such as heat ducts running under the floor, or air flow from heat registers in a forced air system.
4. Label the lead of the redundant thermostat so that the next person occupying your home will know what it is. You may also consider noting the position of the thermostats in the box housing the actual thermostat.
