Purchase flow very satisfied. Device is working properly. One should be aware in advance only that the waterworks two pressure switching points has to be approached. If the pressure drops below 1.5 bar, the pump switches on again and brings the pressure to 4 bar. It is depending on the decrease for a certain period only 4 bar pressure initially to 1.51 bar at the end available. While this saves electricity but when casting sometimes disturbing, since one must always wait for the full pressure. Previously I had a pump without Rerservoir that I would buy again.