A heating tube is a long electric heating element, usually in a tubular structure. It is made of a high-temperature resistant metal tube (such as stainless steel tube), with electric heating wire or heating strip inside, and filled with insulating material (such as magnesium oxide powder). One or both ends of the heating tube are sealed to prevent the external environment from entering the tube. The heating tube heats the internal electric heating wire or heating strip through current, thereby transferring heat to the surrounding medium.
