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