why can’t you get hot water from a faucet when the freshwater supply is turned off, even though there’s a water heater full of water being heated and at the ready?
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Because the water heater is usually in the basement, and water flows from high places to low places.
So normally what happens is the fresh water pipe that goes into the water heated (so the water can be heated up) has pressure and pushes out the hot water that’s in the heater tank. Without fresh water pressure, water will just flow from high (your faucet on the main floor) to low (the water heater in the basement).
That’s the point of [water towers](https://upload.wikimedia.org/wikipedia/commons/d/df/Plymouth_Township_Watertower_002.jpg) by the way, to supply water to the city. Because it flows from the high tower to the ground-level houses. And they periodically refill the tower using pumps.
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