Shocking - their Nest is not fit for purpose. The thing works for a week or two then blows. We're on our second replacement. There's some sort of hardware problem - a diode I've read - that always blows. Rather than fixing the product, they keep sending out the same faulty series three thermostat. A potential PR disaster for Google if consumer interest bodies get wind of this. Do not buy one. We're fitting an old school one instead now.
