This kettle is awesome. I got this because I started making a lot of tea, and it seemed wasteful to use the stove to boil the water.

We decided to test this kettle when we got it. We filled it to the "max" line, which is 7 cups, and timed it as it boiled. It took about 7 and a half minutes for the kettle to turn off, which appears to be after it's boiling. We tried this again with 2 cups of water; the minimum on the kettle and what I use for tea. It took closer to 2 minutes for 2 cups. After a few more test runs, it seems to take just about a minute per cup to bring to a boil. We pay 11 cents per kilowatt hour, so it costs me about 2 cents of electricity when I boil 7 cups of water. For 2 cups it costs me less than half a penny.

This kettle is much more efficient than boiling water on the stove. To the point that I sometimes pre-boil water in it when I'm cooking. We're very happy with this purchase.