I have bought this immersion heater in April 2014 and October 2014 he gave up his spirit. The exact reason I do not know, but I assume that was activated by a little carelessness of the overheating protection. Thus, the immersion heater was broken beyond repair, because he has no push button to restore the overheating protection.
This immersion heater is therefore only suitable for "infallible". I have now bought an immersion heater, which has a push-button, with the overheating protection can be reactivated. Although the cost 10 more, but pays for itself. No buy recommendation for lack of automatic.