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How a Coffee Espresso Machine Works Understanding how complex devices work can make them easier to understand and appreciate. It will also help you decide which one is best for you. Temperature and pressure of water are two of the most important factors in espresso machines. Water needs to be between 195 and 204 degrees Fahrenheit in order to achieve optimal flavor extraction. The pressure is crucial, but if it's too high, the coffee will taste bitter. The ideal pressure for coffee is nine bar. Types If you are a coffee enthusiast and want an intense, fuller-bod