We did one year, when at the beginning of the 'season' we discovered a leaking tap in the bathroom (the leak was underneath the basin and not immediately visible). We discovered it was due to a valve 'blowing' inside the tap connection, due to water inside the valve expanding when frozen. We were advised to leave all taps half on in the winter, even after draining the water system, to ensure this didn't happen again. This advice was given to us by a nice man in Narbonne Accessories near Montpellier (which was where we were when we discovered the leak) and he had exactly the right valve to replace the problem one. However, we couldn't get it into the tap so we went back again, and he knocked off the price of the valve from the price of the new tap so we couldn't complain! He was very knowledgeable - especially as they hardly ever get freezing weather down there!