Features of a great electric tea kettle include distinct measurement markings, noticeable on and off lights, see-through glass to display water level and an audible signal when the water is boiling, according to Better Homes and Garden. An excellent kettle should also be easy to maneuver.
Other features that are very useful are light weight, a large water opening, variable temperature settings and a keep-warm mechanism to make re-boiling faster. In case of a problem, the company's customer service should be responsive. Characteristics to avoid include a breakable glass carafe, poor directions and hidden water level. In addition, tea kettles should not be heavy, difficult to clean or complicated to use.