Electric kettles with insulation function mostly have two heating tubes, one of which is individually controlled by an insulation switch, allowing users to control whether or not to insulate. The insulation power is generally below 50W, and it usually consumes no more than 0.1 kWh of electricity per hour.

The whistle type electric kettle is made of stretched aluminum plate, and the electric heating element adopts a submerged nickel plated steel sealed electric heating tube. The electric heating tube is installed at the bottom of the kettle, and a heat-resistant sealing ring is padded at the junction with the kettle body to prevent water leakage. This type of electric kettle is equipped with a strip shaped vibrating spring plate buzzer (air flow vibrating whistle device) on the lid, which will sound when the water temperature reaches 100 ℃ or above. Due to the fact that this type of kettle is generally not equipped with a temperature limiting controller, it is necessary to manually cut off the power supply. This type of electric kettle has a simple structure and low price, and is widely used in residential households.