The kettle. A massive household energy absorber. Mum wants tea. Dad wants tea. You want tea, often all at different times. And sometimes, if you're busy, you might want a coffee - all require the boiling of a kettle. It is an energy black hole. So, how can you cut down on kettle use? Is there such a thing as an energy efficient way to generate hot water? Yes! There is! Allow me to demonstrate. Follow this advice and save pounds...