Hello Christiane. I appreciate your review. I had the opportunity to test the water heater equipment myself. As expected, I was able to use it for several baths, not having any problem during that period. Please note that there was no other complaints before your stay or even after. So, I presume that you may not have identified yourself with the instructions of use posted inside the apartment. We must not forget that this equipment is not a boiler, it is a water storage tank, with a relative high capacity compared with others available. It´s functioning depends on the time spent in the bath, as well as the period of time spend on heating, like any other similar equipment. Thank you for your review.