"Installed this device in a property that is being renovated. The system isn't run very often due to continual room by room modifications. If the system is turned off at the mains the remote unit drains its batteries in a week as it searches for the receiver so don't forget to remove them if you're intending to leave the heating off for a period of time. I'm using high quality branded batteries but they do not make a good connection resulting in the unit constantly losing power. When it does work I remain unconvinced that the temperature displayed is correct. I'm yet to sit down and attempt to fix and test this thermostat in earnest but I am very disappointed with its apparent flaws straight out of the box."