Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They make a rich, flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to get the best extraction. Beware https://www.coffeee.uk/products/salter-espirista-coffee-machine-with-milk-frother