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Haden Heritage Black Kettle - Fast Boil - Boil Dry Protection - 3000W Energy Efficient Kettle - Spare Filter Included In The Box - BPA Free - 1.7 Litre Stainless Steel Kettle : Amazon.co.uk: Home & Kitchen
In order to double the thermal efficiency of the kettle, what kind of design can be achieved without changing the material? - Quora
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