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What is more efficient - filling the kettle with cold water or hot water?

What is more efficient - filling the kettle with cold water or hot water?

Update: 2025-10-16
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Professor Richard Easther, from the University of Auckland joins Emile Donovan to explain.
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What is more efficient - filling the kettle with cold water or hot water?

What is more efficient - filling the kettle with cold water or hot water?