Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat water to near boiling and force it through tightly packed finely ground coffee in a portafilter to extract an espresso that is concentrated. Many models let you regulate important espresso variables like temperature and pressurization. https://www-coffeee-uk03230.bcbloggers.com/29354941/the-most-effective-advice-you-ll-receive-about-bean-to-cup-espresso-machine