The proven basic model of Vaillant's electric instantaneous water heaters guarantees basic hot water supply in flats and office blocks. The VED is a hydraulically controlled instantaneous water heater which can be used without any restriction for the decentralized supply of domestic hot water. This powerful appliance for the quick supply of domestic hot water offers basic conveniences tailored to demand: e.g. if the user needs hot water to wash his hands he may easily reduce the temperature at the rotary knob from the maximum output to a medium hot water outlet temperature. In addition, the water heater again reduces its output by 50 % via the integrated water quantity control if the users only require small water quantities. Thus, the VED offers four output stages which automatically keep the power consumption low by adapting the output to the desired hot water quantity.