Only boil the amount of water you need:  This will save energy and time, as boiling a full kettle takes longer and uses more energy than boiling just the amount you need. Regularly descale your kettle: A build-up of limescale can reduce the efficiency of your kettle, so make sure to descale it regularly, especially if you live in a hard water area. Consider a temperature-control kettle: This will allow you to heat the water to the exact temperature you need, rather than boiling it unnecessarily hot.