I like to drain the water heater if the coach is not going to be used for a couple of weeks. In the past I have had the water start to smell a bit if it was left in the water heater for too long. I could fun the water for a while after hooking back up but that would take a while. I prefer to drain the tank if it will sit for more then a week. The water in the lines is not an issue because I run them to flush them out every time I hook up.
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