They are designed for supplying hot water for such receivers as wash basins, sinks, showers (using original manufacturer’s sprayer set). Heating element structure is designed for permanent work under water pressure up to 0.65 MPa. Any kind of pressure tap battery therefore can be fitted to the heater. Connection to the water supply system can be executed using flexible rubber hoses with rubber gaskets. Small dimensions and easy assembly of the heaters make possible to perform quick assembly and to hide the appliance under sink or wash basin. Traditional mechanical power switching on mechanism has been eliminated in order to miniaturize and improve reliability of the heater. It was replaced with electronic system controlling heater’s work, reed relay flow sensor as well as electronic power switch (triac – triode AC switch).