Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich, delicious cup. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to ensure the highest extraction. Beware of https://www.coffeee.uk/products/tower-espresso-machine-with-frothing-function-glass-carafe