As the leaseholder, you are completely and solely responsible for any damages incurred to the vehicle by excess cooling, frost, or freezing of the tank, water boiler, and pipes. These costs are not covered by any insurance. Please note the instructions given to you by the respective rental operator; the following generally applies:
If temperatures are expected to be below freezing, all pipes as well as water and chemical tanks must be drained. If freezing temperatures are expected, the rental depot will already have drained all water and made the vehicle “winter-proof” before departure to protect against possible freezing. "Winter-proof" means that the water has to be drained from all tanks. Afterwards, the fresh water tank may no longer be filled with water and the water supply cannot be used. There is no water available in the vehicle. The renter must then purchase their own water in bottles and any resulting costs for drinking water must be paid by the renter themselves. Sinks, showers, and toilets cannot be used. It may be possible to use the toilet in some cases, provided that it is flushed using a windshield antifreeze product. In severe frost, however, the use of toilets is not possible even with this method, and you will have to find public toilets.
It is the sole responsibility of the renter to winterise or return the vehicle in a winter-proof state, in case the winterisation has not been done when the vehicle is picked up in a warmer area or if it is removed during the journey. In the case of a violation, regardless of the prevailing weather conditions when returning the vehicle, a fee will have to be paid. When planning your route, please bear in mind that camping sites in some areas may be closed in winter. Even some roads, especially in the mountains, may be partially inaccessible in winter conditions.