Descriptors | Immersion heaters, Water heaters, Electric heaters, Portable, Heaters, Aquaria (ornamental), Electrical household appliances, Electrically-operated devices, Rated voltage, Testing conditions, Marking, Symbols, Electrical safety, Type testing, Electrical testing, Heating tests, Temperature rise, Leakage currents, Protected electrical equipment, Watertightness tests, Damp-air tests, Dielectric-strength tests, Mechanical testing, Impact testing, Flexible conductors, Electric terminals, Dimensions, Earthing, Electric connectors, Leakage paths, Clearance distances, Thermal testing, Pressure testing, Fire tests, Tracking index, Corrosion tests, Test equipment, Test fingers, Circuits |