Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat water until near boiling and force it through a tightly packed finely ground coffee into a portafilter to extract an espresso that is concentrated. Many models allow you to regulate key espresso elements, such as https://coffeeeuk14716.blogscribble.com/29902902/a-productive-rant-about-bean-to-cup-espresso-machine