[C320-list] winterizing

[jim brown]

In thinking about winterizing this year I began to wonder why it's necessary to drain the water heater bone dry to prevent freezing damage. If the drain is open and there is a small amount of water left, when it freezes wouldn't it just expand by going up and cause no pressure damage on the sides or bottom? Same for the water tanks?  I always vacuum out the hot water tank and make sure the water tanks are dry but wonder if it's necessary. 


Jim Brown
Desafinado