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AnswerIf you mean the pressure relief valve, it is located near the top of the water heater and has a lever on it to release water and relieve pressure. It opens automatically when pressure is too high and can also be opened manually at any time.

WRONG !

The spill switch is a device designed to sense and unsafe condition on a gas fired appliance. Specifically either CO (carbon monoxide) or extreme heat, or in some advanced models one or both. It senses these "spilling" from the exhaust flue and through an electrical connection, shuts off the supply of gas to the unit. It is generally located on or next to the flue pipe as it leaves the unit and enters the wall or chimney. The previous answer refers to the T&P or temperature and pressure relief valve, designed to let water and pressure out of the system when it produces too much pressure in order to prevent an explosion.

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