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Kelly Kettle + idiot = burnt kids

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#31 Steve Walker

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Posted 18 August 2018 - 01:00 PM

Thats a relevant point phone - cheap espresso machines generate pressure by heating the water in a pressure vessel. Expensive ones have a high pressure pump. The problem with the cheap machines is that the water is too hot - the optimum temperature for making espresso is less than boiling point, somewhere between 90C and 95C depending who you ask, so superheated water is right out.