Electric kettles work through a shielded heating element, activated when the kettle is plugged into an outlet. They shut themselves off automatically when the water reaches a specific temperature, boiling water faster than stove-top tea kettles. Some kettles whistle to indicate heat, while others do not; this is contingent upon the design of the product.
Electric kettles are made from either plastic or metal. Some contain settings such as "Keep Warm," while others have no programmable settings, which can simplify the process for some people. Many have water windows where it is possible to see if the water is boiling. They are a good choice for those looking for energy-efficient devices that heat quickly.