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Hot water taps are convenient and a bit of a marvel but the idea they are ‘green’ or even economical as Quooker would have you believe seems a bit of a stretch.
I was thinking the same if comparing just Vs a kettle as you'd need to wastefully heat about 2.5 litres to equal the standby energy. The combi makes a better argument.
https://www.quooker.co.uk/energyWith over filling kettles by just 1 litre per day (three extra cups 3x per day) and running taps to finally get hot water (1 litre at 50° three times a day) lots of houses would easily break even or win on the energy.
Factor in the £1k purchase and service costs it looks less attractive once more. Especially if you have any form of solar power to heat your water or power the kettle.
Hot water taps are convenient and a bit of a marvel but the idea they are ‘green’ or even economical as Quooker would have you believe seems a bit of a stretch.