If you’re only going to drink a single mug of tea then the kettle is actually horribly wasteful. It’s better to microwave a single mug.
The good thing about electric kettles is that you can fill them with exactly the amount of water you need, and if it’s only a mug full it boils really fast, and without having to worry about whether your mug is microwave-safe.
It’s been my experience that you can safely ignore that line, especially if you’re in the room to manually turn it off (my kettle tends to turn off kind of late, especially when I put only a small amount of water in it).
The good thing about electric kettles is that you can fill them with exactly the amount of water you need, and if it’s only a mug full it boils really fast, and without having to worry about whether your mug is microwave-safe.
I guess if you have a really small kettle maybe? The minimum fill line on all the ones I’ve had is like half a liter.
It’s been my experience that you can safely ignore that line, especially if you’re in the room to manually turn it off (my kettle tends to turn off kind of late, especially when I put only a small amount of water in it).