Coffee And Espresso Machines Espresso machines make use of pressure to force water through finely ground and tamped coffee beans. They make a rich, tasty brew. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to get the best extraction. https://www.coffeee.uk/products/de-longhi-stilosa-ec-230-bk-espresso-machine-black