I have a gas water heater that I nominally set to "vacation"; about 5 minutes before the evening shower I click the stat so it fires up then turn it right back down to vacation- it stays on. The shower is the only time I want really hot water and the rest of the time the water is quite hot enough for laundry, hand washing, dishes and whatnot. I'm not sure but it's possible that when I click it on that's the only "on" cycle every 24 hours.
The next step is to run a string from the bathroom to a lever on the stat...
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