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How a Coffee Espresso Machine Works Understanding how complex devices function will make them easier to use and appreciate. It can also help you determine which one is right for you. Water temperature and pressure are two important aspects in espresso machines. Water needs to be between 195 and 204 degrees Fahrenheit in order to achieve optimal flavor extraction. The pressure is crucial however, when it's too high the coffee will taste bitter. The ideal pressure is nine bar. Types If you're a lover of coffee