![We tested all the best kettles from Bosch to Russell Hobbs - and the winner could help cut your electricity bill | The Sun We tested all the best kettles from Bosch to Russell Hobbs - and the winner could help cut your electricity bill | The Sun](https://www.thesun.co.uk/wp-content/uploads/2022/09/sun-features-kettle-test-grant-759340092.jpg)
We tested all the best kettles from Bosch to Russell Hobbs - and the winner could help cut your electricity bill | The Sun
In order to double the thermal efficiency of the kettle, what kind of design can be achieved without changing the material? - Quora
![We tested all the best kettles from Bosch to Russell Hobbs - and the winner could help cut your electricity bill | The Sun We tested all the best kettles from Bosch to Russell Hobbs - and the winner could help cut your electricity bill | The Sun](https://www.thesun.co.uk/wp-content/uploads/2022/09/sun-features-kettle-test-grant-759339977.jpg)