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How a Coffee Espresso Machine Works Understanding how complex devices function can make them easier to use and appreciate. You can also determine which device is the best one for you. Two of the most important espresso machine elements are pressure and temperature. Water needs to be between 195 and 204 degrees Fahrenheit for optimal flavor extraction. The pressure is important however, when it's too high the coffee will taste bitter. The ideal pressure is nine bars. Types If you're a coffee lover and prefer more of a fuller, ri
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