Water Heater: Pressure relief valve is dripping water
Replace the pressure relief valve if it leaks and the water heater isn't overheating.
If the water is overheating, the dripping could be because the overheating tripped the valve. Shut off the circuit breakers and check the thermostats and heating elements. A failed thermostat can cause the element to heat constantly, resulting in overheating. A heating element shorted to the metal tank or cabinet will also heat constantly and cause overheating. Watch this video to find out how to troubleshoot an overheating electric water heater. Replace any failed thermostats and shorted heating elements.
Replace the thermostat in a gas water heater if it's causing overheating.
These repairs may help solve your water heater problem
Replace the water heater temperature-pressure relief valve
The temperature-pressure (T&P) relief valve is a safety device that automatically opens to discharge hot water in the event of excessive temperature and/or pressure inside the tank. Replace the T&P valve if it leaks or malfunctions.
If a water heater's temperature and pressure relief valve opens and releases hot water even though the water heater isn't overheating, the relief valve could be damaged. This repair guide and video shows you step by step how to replace the T&P relief valve.
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.
If your electric water heater runs out of hot water quickly, or if the water isn't as hot as it should be, the heating element could be the problem. This step-by-step repair guide and video show how to replace a water heater heating element.
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.