Coffee And Espresso Machines Espresso machines make use of pressure to force water through finely ground and tamped coffee beans. They create a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to achieve optimal extraction. Beware of https://www.coffeee.uk/products/fimei-espresso-machine-with-milk-frother-20-bar