A kettle wants as many watts as it can reasonably be provided with -- you&#x27;re heating a fixed volume of water by a fixed temperature rise (from cold to boiling), so the more power the faster the kettle boils (and if you have a lower-power kettle it doesn&#x27;t use less energy overall, it just takes longer). Thus kettles are typically designed to draw more-or-less the maximum permitted current for the usual UK domestic socket.