Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat the water to near boiling point, then force it through finely ground coffee packed tightly into the portafilter. This creates a concentrated espresso. Many models let you regulate key espresso elements like temperature and pressure. https://www-coffeee-uk48660.answerblogs.com/30025081/a-brief-history-of-the-evolution-of-best-home-espresso-machine