After switching on the device, hot water can be drawn off after 30 minutes. The ceramic-coated boiler is built vertically and has an integrated expansion tank, the big advantage: the hot water collects at the top because of the greater difference in height and does not mix with the inflowing cold water. The hot water can be removed down to the last drop. After pressing the main switch on the front left, it lights up red (device is in operation) until the set temperature has been reached via the temperature controller on the right, after which the indicator light in the switch goes out and the device switches off even though the main switch is on.( The set temperature is reached) As long as the main switch remains switched on, the device will maintain the set temperature, and the heating el.