How To Shut Off Gas Water Heater. Gas water heaters need to have a flow of gas to the pilot light in order to remain working. If the gas supply is blocked, or if the amount of gas isn’t sufficient, the pilot light won’t stay lit.
The thermostat is located near the bottom of the water heater. Turn off the gas or electricity to the water heater. You create more problems by turning off the water heater between uses and back on within short periods of time.
Check to make sure that the water heater has turned off.
There are a few things that could be causing your electric tankless water heater to shut off. Here are a few possible reasons why your gas water heater keeps turning off. The water heater gas valve is located toward the bottom of your water heater just above the burner chamber. Go to your circuit breaker panel, find the breaker for your water heater, and switch it to the off position.