Any idea how much gas it does use to do this?
My parents have a gas water heater with the electronic ignition so the gas water heater is on a timer, it only comes on twice a day for around an hour each time, 5-6am and 3-4pm so that it turns off before much of the hot water is going to be used, kind of like heating up a tea ketel on the stove, you heat it up then use it, after you make your cup of tea you might fill it up but you don't turn the stove burner back on, so why turn your water heater back on after taking a shower, turn it on right before you take the shower, or wash the dishes.
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