So it may be only the previous four weeks in use but I abkoche for my son several times a day water FÜS Flässchen it is almost day and night use. I can only say that it looks class and also is super handy, because you can adjust to how many degrees the water to be heated, and you can also set that he should keep the temperature! In addition, the Kalksiebe more than adequate. 5 star has definitely earned this Water Boil.