A household heater is an electrical device that converts electrical energy into thermal energy for indoor or object heating. They are widely used in winter heating, heating water, drying clothes, and other fields. Electric heater is the most common type of heater, which heats indoor air through heating wires to achieve the purpose of heating up. But electric heaters have a high power output, so safety precautions should be taken when using them.

A rechargeable heater is an electric heating device characterized by a built-in rechargeable battery that can be charged through a USB charging cable or other charging methods. Its working principle is similar to traditional electric kettles or electric heaters, both of which use electrical energy to generate heat energy. However, the difference is that rechargeable heaters do not require a continuous external power supply, making them particularly practical outdoors or in environments without a stable power supply.