I live in NC so I don't get much cold weather. But, when it does get really cold, sometimes I have no hot water. I mean none. If I turn my faucet on all the way turned to hot (left), nothing comes out. Not even cold water. This has only happened in the morning after really cold nights. And the hot water slowly comes back as the day gets warmer. I have a gas water heater in my garage, which is not heated. Where would the water be freezing? Outside the house or in the garage?