How To Safely Turn Off Gas Water Heater. Turn off the water isolating valve beside the water heater. To light an electric water heater, start by setting the temperature control to the lowest temperature and turning the gas regulator valve to the “off” position.
To turn off the gas supply to the water heater: Walk through shutting off your water heater before you have to; Two reasons not to turn your water heater off 1.
Begin turning on a gas water heater by checking for open water valves or faucets.
Turn off the water heater…? When the water heater came on to heat up its reservoir, it would cause the water to expand, and therefore pressurize, to the point where the tank or a pipe would rupture. If you ever turn on your faucet and have steam instead of hot water and/or your t&p valve is releasing steam or water, immediately shut off the fuel source to your hot water heater. If the valve is parallel with the pipe, it means the gas line is open.