Review: Heat Genius

Features and performanceSmart heating systems are all the rage these days. Every home should have one. But it's only when you start using something like Nest, Tado, Hive, Honeywell's Evohome or Heat Genius for several months that you realise just how wasteful your old, dumb central heating can be.A traditional heating system typically operates with a thermostat and a seven-day programmable timer. For each day, you'll preset the times at which you want the heating to switch on and off, and specif