Water Heater: Not enough hot water
A failed heating element or defective thermostat could result in not having enough hot water. Examine your thermostats and elements and replace any defective components. A buildup of sediment in the bottom of the tank can also result in not having enough hot water. Shut off the electricity and water supply to the water heater and then drain the tank to flush out tank sediment. Refill the tank before restoring electrical power to an electric water heater to avoid damaging the heating elements.
Check the size of your water heater. Consider replacing your water heater with a larger capacity model if your current model doesn't supply enough hot water to meet your needs. A 40-gallon water heater typically supplies enough hot water for a family of four with normal water use. Sometimes, you'll use up the hot water in the tank and you'll need to wait for the tank to recover before hot water is again available.
Replace the water heater heating element
The heating element is the heat source inside an electric water heater. It extends directly into the tank, where it radiates heat energy to the water around it. If the heating element is not heating when activated, replace the heating element.
Replace the water heater thermostat
The thermostat constantly monitors water temperature in the tank. When the water temperature drops beneath the desired setting, the thermostat sends power to the electric heating element or gas burner to begin heating. If the thermostat isn't sending power to the heating element, replace the thermostat. In a gas water heater, replace the gas control assembly that contains the thermostat.
Drain water heater tank sediment
Maintain your water heater by regularly draining the tank to flush out sediment. Every year, empty all the water from your water heater to prevents mineral sediment in the bottom of your tank that could reduce the water heater's effectiveness and possibly damage the heating elements. For instructions, see How to drain the tank on an electric water heater video.
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