Date:31 December 2009
Do not throw away your kettle with a concealed element when it stops before the water boils: a good going-over with Calciclean might just revive it.
What happens is that although the dry-boil sensor is set to trigger at about 105 degrees, the deposits at the bottom of the kettle (limestone, etc) insulate the sensor, with the result that it reaches a higher temperature than the water (which should stay below 100 degrees).
Brown vinegar also works well, but it smells a bit.
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