Coffee And Espresso Machines Espresso machines make use of pressure to push water through finely ground and tamped coffee beans. They make a rich and flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars to achieve optimal extraction. Beware of https://www.coffeee.uk/products/swan-espresso-machine-with-milk-frother-15-bar