he heaters are designed for warm water supply to wash bowls, kitchen sinks and showers. Thank to bigger power comparing to heaters supplied with 230V it is possible use single heater for warm water supply to wash bowl and shower for example. The only condition is to install water taps with a distance not bigger then 2 meters one from another. Design of heating element allows water to be delivered under constant pressure of up to 0.65 MPa. Thank that it is possible to install any kind of water tap. Connection to the water installation can be realised by means of flexible hoses with rubber seals. Heater’s small dimensions as well as easy assembly allow quick installation and easy hiding the device under wash bowl cabinet for example. Power supply can be realised using only three cables: two fazes and protection wire. Traditional hydraulic power switching system was eliminated in order to miniaturise the heater as well as increasing its reliability. Electronic one containing electronic control circuit, contactor flow sensor, as well as two electronic connectors (triac).