Back in the winter of 2008 when I was a novice at this canal boating lark I was totally unprepared for what damage could be caused by frost. All I did by way of precautions was to switch everything off and lock up the boat. Big mistake as when I returned to the boat a month later and switched everything back on I wondered why the water pump didn't cut out, then I heard running water!!!!!! To cut a long story short the bath/shower mixer tap was split in half, the bathroom sink cold water tap was split in halve and four pipes had burst in the calorifier cupboard all at right angle joints. I managed to fix everything myself at a cost nearly £200. Some time later I learned that most freezing happens between the water line and gunnel height which is exactly what happened to me.