Rotation Kettle / Rotation Kettle

This is a free-of-stirring kettle, who is used for cooking tea. A helical glass bottle is fixed inside the kettle for realizing the free-of–stirring. When the water is boiling, numbers of bubbles will rise and rushed into the helical bottle. These bubbles
will drive water and tea (or other drink material) into a whirlpool which accelerates
the cooking. What’s more, streaming the water at the first time of boiling will prevent bumping.