We installed our electric under-floor heating system 3 years ago. Unfortunately, the thermostat broke down and had to be replaced. I was lucky to find this company based near the Pyrenees and ran by an English man, Will Spray.
See this web site here.
The service was quick and excellent and we received our thermostat 48 hours later by registered post.
If you live in France and are looking for an electric under-floor heating system, I highly recommend this company.