This standard specifies requirements for withdrawable and non-withdrawable types of electric immersion heater for use in thermostatically controlled storage water heaters. The electric immersion heaters are intended for use in single-phase circuits, the voltage of which does not exceed 250 V phase to neutral and that have a load rating not exceeding 10 kW.
2 This standard is also applicable to thermostatic immersion heaters that are intended for use in single-phase circuits with the same voltage and load rating as stated above.