Coffee And Espresso Machines Espresso machines make use of pressure to push 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 the minimum pressure of 9 bars to achieve optimal extraction. Beware of manufacturers https://www.coffeee.uk/products/smeg-ecf01whuk-espresso-coffee-machine-retro-style-white