Since the boiling point of the kettle is way lower than any metal, it might start dissolving when the water is heated. This is probably the reason why plastic is not used in kettles. So the answer to the question is Yes! the plastic electric kettles are toxic for you. The easiest way to be assured that the electric kettles are safe from any contamination issue is by checking if the manufacturer has mentioned it as BPA-free or not. BPA is the chemical that releases from plastic when it comes in contact with hot boiling water. You might be able to see some plastic used on the handles and lower part of stainless steel kettles and glass kettles which is completely fine since those parts never get in touch with the boiling water.