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It is done that way to ensure the tank is completely full to help avoid water hammer. If the water came from the bottom there would need to be a way to vent the top of the tank or it would create a place to for air to pressurize. Water will not compress and air will so if the tank had air in it every time you turned the water off it would have the trapped air in the top of the tank that would compress and puts extra stress on your Plumbing possibly causing it to break or blow apart.

The above was a GREAT Guess shame most of the answer is wrong

Note a new phenomena was found (4,000 years ago) that hot water molecules RISE and cold water is denser (heavier) thus knowing the hotter water in a vessel is on top it would make sense to draw from the point the water is hotter

About air can cause watter hammering then all the manufacturers and designer of "air chambers" should be sued for designing a product that had an air causion to prevent hydraulic shock

Many commercial water heaters have side outlet thus the theory of air is kind of shot down.

Regarding the air pressure putting extra stress on the vessel this would be true If the Gods of ancient cultures did not make a sacrifice to the T&P Goddess so that "air" would be released @150 PSI on most storage tanks and vessel heaters

It is a terrible shame that some who give advice regarding pressure vessels and piping systems did not attend the God of plumbing / piping an National Board Of Boiler inspectors classes given in ancient Rome thus they give inept advice

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Q: Why is water that leads to hot water taps taken from on top of the water tank?
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