How a Coffee Espresso Machine Works Understanding the intricate way that devices function can help them to understand and appreciate. You can also choose which device is right for you. Water temperature and pressure are two important aspects in espresso machines. Water should be between 195 and 204 degrees Fahrenheit https://coffeeeuk69684.blogs100.com/30300515/here-s-a-few-facts-about-coffee-espresso-machine