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How a Coffee Espresso Machine Works Understanding how complex devices work can make them easier to use and appreciate. It can also help you decide which one is best for you. Two important factors in espresso machines are water temperature and pressure. The water temperature should be between 195 and 204 degrees Fahrenheit in order to achieve optimal flavor extraction. Pressure is also important, but too much can muddle the flavor of the coffee. The ideal pressure for coffee is nine ba