The basic structure of a tubular electric heater is a metal tube, also known as a tubular electric heating element
A tubular electric heater, also known as a tubular electric heating element, is one of the most common resistive electric heating devices. It utilizes the Joule heating effect generated by current passing through a resistance wire to convert electrical energy into thermal energy, widely used for heating liquids, air, and solid media.
Considering your location in Yangzhou City (a core cluster of the domestic electric heating appliance industry) and the latest industry standards in 2026, I have compiled the core structure of this equipment, local procurement guidelines, and selection recommendations for you.
⚡ Core Structure and Working Principle
The basic structure of a tubular electric heater is to place a spiral resistance heating wire inside a metal tube (outer tube), fill the gaps with magnesium oxide powder that has good thermal conductivity and insulation, and process it through tube shrinking and heat treatment processes.
Outer tube material: Depending on the heating medium, stainless steel (304/316L/321), In800, copper, titanium, or low-carbon steel can be selected.
Heating wire: Usually made of nickel-chromium (Ni-Cr) alloy wire or iron-chromium-aluminum (Fe-Cr-Al) alloy wire.
Insulation filling: Crystalline magnesium oxide powder, which serves for insulation and thermal conduction.
Sealing material: Commonly silicone, epoxy resin, or glass, used to prevent moisture ingress.
