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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 in the portafilter to create an espresso that is concentrated. Many models let you control important espresso variables like temperature and pressure. Super-automatic machines are a step over automatic machines and offer fully automated with programmable espresso sizes and grind, measure and often tamp the beans for you. These tended to score best in our Lab tests. Manu