Electric heating components with various shapes are made by placing the heating wire in the aluminum tube with the aluminum tube as the carrier. The heating wire with silicon rubber insulation is generally used in the aluminum tube heater. It is used for defrosting and thawing of refrigerators and freezers, and heat preservation of pet electric appliances. The heating is rapid, uniform and safe. The required temperature can be obtained by controlling the power density, insulation material, temperature switch and heat dissipation conditions.