Expansion caused by freezing water will damage the barrel. The easiest way to prevent this damage is to drain and disconnect the system in advance of [[Winter#Freezing and Expansion|sub-zero temperatures]][http://climate.weather.gc.ca/climate_normals/]. | Expansion caused by freezing water will damage the barrel. The easiest way to prevent this damage is to drain and disconnect the system in advance of [[Winter#Freezing and Expansion|sub-zero temperatures]][http://climate.weather.gc.ca/climate_normals/]. |