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Boris Johnson and money saving kettles.

Sparkingchip

The comment https://youtu.be/GNTNI0yhMjE

For the defence https://fullfact.org/news/Boris-Johnson-new-kettle/

My question, is it just a ridiculous analogy because there’s no such thing as an energy efficient kettle? 

Only behaviour change with people heating exactly the amount of water required rather than overfilling kettles will reduce energy consumption, people are just going to have to be told to be more frugal and be careful when  using appliance to ensure they are being energy efficient.

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    More likely, it's about thermal conductance between the element and the water.

    Sounds plausible - an element covered with limescale is going to take longer to heat up the water. It's not that less heat is generated - just it's harder to get that heat into the water, so the element itself contains more of the heat (i.e. is hotter) when boiling finishes. Unless the kettle is immediately re-filled and boiled again, the extra heat in the element will be gradually lost to the surroundings.

         - Andy.

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    More likely, it's about thermal conductance between the element and the water.

    Sounds plausible - an element covered with limescale is going to take longer to heat up the water. It's not that less heat is generated - just it's harder to get that heat into the water, so the element itself contains more of the heat (i.e. is hotter) when boiling finishes. Unless the kettle is immediately re-filled and boiled again, the extra heat in the element will be gradually lost to the surroundings.

         - Andy.

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