How To Turn Off Hot Water Heater Valve. Make sure to turn off your hot water heater circuit breaker by using your main circuit breaker panel or a panel near the water heater depending on how your water heater is setup. Turn the tap clockwise to shut off.
Turn the gas valve 1/4 turn until the lever is perpendicular to the gas line to shut off the gas. If the relief valve has mineral buildup or corrosion, it may take some effort to get the valve to turn. Using the crescent wrench, carefully remove the relief valve from the water heater tank.
It costs more money to reheat the water later.
Leaks can happen for a number of different reasons: Turning off your water heater may be necessary in the case of a plumbing emergency, like in the case that your cold water line loses pressure and fails to fill the water tank, or in the case that your water tank empties for any other reason. Usually this will be on the left side as you look at the heater towards the bottom of the heater. If you have a hot water cylinder with a cold water storage cistern.