Kettle/flask
Keep a flask beside the kettle: it takes more energy to heat a kilo (1 litre) of water than to heat a kilo of steel to 100 degrees C.
Pour off the unused hot water into the flask and even if you require another cuppa 3 hours later it'll boil in about a fifth of the time when poured back into the kettle. Or use it for the wash up later!
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