Microwave Tea Kettle Microwave Tea Kettle boils water twice as fast as a stovetop kettle, and blows its whistle to let you know it! Water is piping hot for tea, instant coffee or soup...in the time it takes to reach for a mug. Instead of turning on a burner that takes longer to heat liquids...zip this 2-cup pitcher in your microwave and save energy. Dishwasher safe plastic pitcher measures, too, in milliliters and cups.