(Sorry for writing in English, my German is virtually nonexistent. However, we just love this product so I wanted to share the experience - especially since there were no earlier reviews.)
I & my wife just love this new convenience of readily available hot water for coffee and tea. I run my own small business from home, and whenever I feel like and have time for a break, I can just grab my mug and mix a cup of instant coffee in less than a minute - no need to start to boil the water first.
You can get water in three ways: 1) by pressing the air-pump on top; 2) by pressing the button in the panel; 3) touching the cup-sensor with your cup - just one hand needed.
A full tank of 3.2 litres of cold water takes about 30 minutes to boil.
We used to have an electric water kettle, but it broke, and actually boiling water 4-6 times a day with a powerful several-hundred watts kettle wastes much more energy than boiling it once and then just keeping it hot with 40 watts an hour.
We have used this Elektrische Thermoskanne 3,2L Wasser Spender
for about three weeks now. The product appears very durable with good quality and very good Price vs. Quality Ratio.
(For easier water-level monitoring, the window could be wider and even include a LED light so you would just notice low water level without particularly having to check.)
We can warmly recommend this "Wonder Pot" made by First Austria.