Electric heating tube is a device that converts electrical energy into thermal energy. It generates heat through a spiral heating wire inside a metal tube when electrified, and transfers the heat to external media via insulating materials. Its core structure includes a metal casing, heating wire, and filled insulating material, featuring high efficiency, safety, and ease of maintenance.
Structural Composition
Casing Material: Metal tubes such as stainless steel (304/316L) and copper, offering corrosion resistance and leak-proof properties.
Heating Element: Spiral nickel-chromium or iron-chromium alloy wire that produces heat when electrified.
Insulation Filling: Magnesium oxide powder (MgO), providing both thermal conductivity and electrical insulation to prevent short circuits.
Sealing Design: Silicone or ceramic seals to ensure airtightness.
Common Types
Straight Tube Type: Simple structure, suitable for water tanks, water heaters, and similar applications.
U-shaped/Ring Type: Bent design for space-constrained equipment such as washing machines.
Finned Type: Enhanced heat dissipation efficiency, commonly used in air heaters.
Application Areas
Widely used for heating liquids (water, oil), air, metal molds, as well as in chemical and food processing industries. Examples include electric water heaters, industrial heating furnaces, and drying equipment.