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Check the shut-off valve above it. It may be turned off or plugged up.

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Q: Why no water going into hot water heater?
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Heater on - water going only to spa - but not getting hot?

If you have no hot water, your heating element is out most likely

What is the point of using a hot water heater?

It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.

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You may have a restriction in your hot water heater exit pipes. There may be corrosion. How old is the house and how old is the hot water heater? What type of pipe is there going out of the hot water heater? You need to know this to fix the problem yourself without hiring a plumber.

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Is it called a hot water heater or water heater?

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