Should one turn off the hot water heater if not using the house for a week? or just leave it on?

Should one turn off the hot water heater if not using the house for a week? or just leave it on?
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answer:I would leave the heater on but turn off the main water supply. I had a small leak in a copper pipe the was undetectible. We left for a week and when we got home the pipe had split and we had water everywhere. If you turn off the main water you will never have to worry about coming home to a flood. Caution, though, when you turn on the water when you get home make sure you have opened all of the faucets and then turn on the main very slowly. I learned if you turn it on too fast and the faucets are not open the pressure can knock sediment in the pipes off and that can lead to clogged faucet heads. The water heater will be fine being left on. The water won’t be used so the tank will be full and the heater will seldom kick on.
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