Which kettle consumes more electricity: with scale or without scale? 

I checked how much time and electricity it takes to boil 1 liter of water with a kettle with scale and a new kettle without scale. The results surprised me) If you are also interested in how much electricity a kettle consumes to boil 1 liter of water, be sure to watch the video.
You can buy an energy meter here
alii.pub/706knm