I drain my cold and hot water systems down as soon as frost is forecast. If the van is used in the winter months we take drinking water in a 10L water carrier. I flush the system through at the beginning and end of winter with Puriclean which I leave in the system for 30 minutes then go for a drive and drain out. My camper has a Fiamma locking filler cap so I use a hose or a water container to fill the water tank. Although I’ve got a 30L tank, I generally don’t drive around with more than 5L of water in the water tank at any one time as it’s just extra weight to drag around.
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