I bought this kettle because I was tired of boiling water on the stove for making tea. The kettle is easy to use and its minimal design looks great on the kitchen counter. I've used it for about 2.5 weeks now. It takes just under 7 minutes to boil 1.5 liters. I taste tested the water temperature about 15 minutes after boiling and it was still very hot. I nearly burnt my tongue. After 30 minutes, the water was still too hot to drink. After 1 hour, it was still hot, but drinkable. After 1.5 hours, it was only warm. And after 2 hours, the water was lukewarm. Despite its ability to keep the water hot for a long time, the outside of the kettle is only warm to the touch.