How a Coffee Espresso Machine Works Understanding how complex devices work can make them easier to use and appreciate. You can also decide which device is best for you. Water temperature and pressure are two key factors in espresso machines. The water temperature should be between 195 and 204 degrees https://coffeeeuk79094.blogozz.com/29326565/5-qualities-that-people-are-looking-for-in-every-coffee-espresso-machine