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On unused hot/cold lines routed through walls, and floors, there is no hot water waiting to be used that would possibly warm up the area. When I turn on the shower upstairs in my house, I wait for about a minute, or two to get hot water from the water heater, which is located in the basement about 30' distance.
Having a shallow well in a temperate zone means I have all the water I will ever need, but doesn't mean that I waste it needlessly. There has never been water usage restrictions in my area.
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