When designing the “Magic Super” water purifier, a small glass of clear water served as model. In order to convey to the user the feeling of drinking particularly pure water, transparent materials were used for the encoder and the tap. Due to dispensing with a water tank, the water purifier is also particularly hygienic and can dispense cold as well as hot water. Coloured LEDs indicate the water temperature in a manner which the user understands intuitively.