Sealed unvented (pressure tested) electric water heater for supplying one or several draw-off points. Variable temperature selection 30 to 50 litres from 5 °C to 65 °C; 80 to 150 litres from 5 °C to 62 °C as well as automatic reheating when the set temperature is undershot and frost protection is selected. Internal steel cylinder with special enamel coating and protective anode for a particularly long service life. Only suitable for operation as a pressure appliance with appropriate safety assembly. Easy installation.