If your water heater is producing only lukewarm water rather than hot water, the issue is typically caused by a failed upper heating element or thermostat on an electric water heater, a malfunctioning gas burner control valve, or a broken dip tube inside the tank that is allowing incoming cold water to mix prematurely with hot water. Additionally, a heavily sediment-layered tank can insulate the burners from heating the water efficiently. Verification: Test electrical elements with a multimeter or flush the tank to remove sediment buildup.
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