Slightly off topic:
When leaving for more than a couple days shutting off the water heater will not hurt it and save you money.
More importantly turn off the water at the main shut off valve. There is nothing worse than coming home to find out just how much water will come out of a tiny leak! I had 2 inches of water in my basement a few years ago from a pinhole leak in a fitting after being gone for 3 days.
Sorry for the hijack
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