In her video, Caitlin asked the question: "If you're about to make a cup of tea and you've already got water in the kettle from a previous boil, do you reboil it, or do you pour the water out ...

The rapid boil Ninja kettle boils 1 cup in under 50 seconds ... good for regulating the temperature and saves me having to put cold water in my drinks! Rapid boil and looks nice." ...