The primary constituents of an immersion heater include:
Heating element: Typically a nichrome or copper wire on an insulating core that generates heat upon electrical current flow.
Insulating sleeve: Safeguards the heating element and averts short circuits with water.
Metal sheath: Encloses the heating element and insulation, commonly copper or stainless steel to resist corrosion.
Thermostat: Regulates temperature by cycling the heater on and off.
Terminal box: Houses electrical connections and offers a secure wire entry.
Protective casing: The external structure shielding the complete unit.