A tubular electric heater is typically composed of a metal tube (commonly made of stainless steel), an internal resistance wire (such as nickel-chromium alloy wire), and an insulating material (such as magnesium oxide powder) filled between them. When current passes through the resistance wire, the wire generates heat, which is then transferred to the external medium through the metal tube wall. This design not only provides efficient heat transfer but also ensures electrical safety, preventing leakage accidents.
