Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They create a rich and delicious cup of coffee. Good Housekeeping Institute experts recommend models that are brewed at 9 bars minimum to ensure a perfect extraction. Beware of https://www.coffeee.uk/products/gaggia-manual-espresso-cappuccino-machine-with-magnet-valve