UK Nest Installation - Underfloor heating including floor temperature sensor/cutoff
If and only if Nest is now producing a thermostat that is designed specifically for in-floor heating.  All thermostats and or controllers that control the water temperature that flows through the floor have a microprocessor and algorithms coupled with actual temperature sensors embedded right in the floor that will in real time design an on &amp; off strategy or a mixing strategy that will heat the room adequately without over-heating the floor surface.  This is a very sophisticated process.  

The Nest thermostat as I understand it is really long on programming capability and the ability to control the heat from a remote location.  It also works well with a home automation system.  But this Nest thermostat simply will turn the heating system on and off. There is a whole other class of thermostat with a whole lot of other functionality that is required to control floor heating systems. Hope this helps.