How a Coffee Espresso Machine Works Understanding how complex devices work can help them to understand and appreciate. You can also choose which device is right for you. Temperature and pressure of water are two important aspects in espresso machines. Water needs to be between 195 and 204 degrees Fahrenheit https://www-coffeee-uk86269.slypage.com/30316133/who-s-the-top-expert-in-the-world-on-coffee-espresso-machine