Turning off the water is a good idea, of course, and also the gas or electricity if it is electric. However, I don' believe the tank would empty itself even if a leak did occur. The worst that would happen is the pressure would drop to zero PSI and possibly a gallon or so of water would be leaked out into the house. That's bad enough, but I don't believe the water heater would be damaged.
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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