Is this a gas fired water heater or an electric?
When you run the hot water is the tank being resupplied by the cold water inlet. You can check this by looking at the water meter and see if it is moving while you run the hot water.
If you have a well you should here your pump kick on.
Make sure you have electric to the heater or if it is gas make sure the pilot is light .
If it is a problem with the water heater it could be an element(electric) or something a simple as a thermocoupler (gas)
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