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How a Coffee Espresso Machine Works Understanding how complex devices function can make them easier to use and appreciate. It will also help you decide which one is best for you. Two of the most important espresso machine elements are water temperature and pressure. For optimal flavor extraction water temperatures should be between 195 and 204 degrees Fahrenheit. Pressure is also important however, too much pressure can muddle the flavor of the coffee. The ideal pressure is nine bars. Types If you're a coffee lover and prefer m