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I'm assuming 'geyser' is a gas hot water heater. -Always best to say if an appliance is gas or electric - If this is a conventional gas water heater then the thermostat will be underneath it, near the gas burner, so the tank will not need to be drained. - - Electric heaters often carry a 'relief valve' on top or on the side, (some people have been known to call this a thermostat.) and this does require lowering the water level before changing, not emptying, just lower than the part you are changing. In either type, make sure the gas or electricity is turned OFF before working .

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Q: Do you need to drain geyser first before removing thermostat?
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