Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat the water to near boiling point and force it through finely ground coffee sucked tightly in the portafilter. This produces a concentrated espresso. Many models let you control important espresso variables like temperature and pressure. https://www-coffeee-uk02119.pointblog.net/watch-out-how-best-home-espresso-machine-is-taking-over-and-what-can-we-do-about-it-71481523