Coffee And Espresso Machines Espresso machines make use of pressure in order to force water into finely ground and tamped beans. They create a rich and delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars to ensure the highest extraction. https://www.coffeee.uk/products/de-longhi-eletta-explore-cold-brew-ecam452-67-g