The electric heating tube is a metal tube, along the tube in the center of the central axis of the spiral electric heating alloy wire (nickel chromium, iron chromium alloy) filled with the gap with a good insulation thermal conductivity of magnesia sand, Or ceramic seal. Electric heating tube is a special electrical components into electrical energy, because of its cheap, easy to use, easy installation, no pollution, is widely used in a variety of heating occasions, stainless steel heating tube life is very long, generally designed to use Life of more than 10,000 hours.