I have three Nest thermostat, I have only had it 15 months, two the thermostats heat link white wireless box become faulty in such a short space of time. Luckily I had warranty which was expiring in 3 months otherwise it would of cost me £400 to replace both thermostat My advice is keep away from Nest and Install simple thermostat or try Hive unless you want throw money at it for replacements
