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Electric kettles are clicking due to hard water scale and thermostat movement, experts say.
Some electric kettles are making a clicking sound even when not in use, puzzling many users.
Experts say this sound is likely due to hard water, which forms scale inside the kettle.
When heated, the scale particles break off, causing a clicking noise as they collide.
The kettle's bimetallic thermostat, which expands and contracts with temperature changes, may also contribute to the sound.
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Los hervidores eléctricos están haciendo clic debido a la escala de agua dura y el movimiento del termostato, dicen los expertos.