Rubbish! Don't waste your money. I got a Nest for my rental property in 2020 and the heat link control is now not working!! No hot water or heating for guests. Screwfix have told me that I can't replace just the heatlink and I need to buy a compete replacement at a further £200. It's a costly way to manage your heating remotely. Best using normal thermostats in my opinion. Very annoyed that I've wasted the money.