Electronically controlled small instantaneous water heater in a set with a touchless sensor tap for energy-efficient and hygienic hot water supply to a wash basin. Automatic, touchless switching on of the instantaneous water heater via the infrared sensor of the tap. Temperature setting up to 42 °C on the side lever of the tap, temperature display via LED color ring in a continuous blue - white - red progression, with activatable hygiene flush (automatic flush every 12 or 24 hours), connection hose x 50 cm. The tap requires a separate 230 V socket in addition to the electrical connection of the instantaneous water heater.