Combined, these features add up to notable savings. Google Nest's research, for instance, showed that users of the Nest Learning Thermostat saved an average of 12% to 15% per year without making other ...

Zoe goes on to say: "You won't notice much of a difference in warmth, but you could see a noticeable drop in your bills. In fact, households with combi boilers could save up to 9 per cent on their ...