Perhaps one of the most popular semi-automatic espresso machines around, the Rancilio Silvia now comes with new and improved features that meet the demands of home baristas and serious coffee lovers. The Silvia is equipped with a commercial-grade brew group and portafilter suited for brewing caf-quality coffee drinks. The brew group and boiler are made of brass for superior heat retention. In addition, the large-capacity boiler has an adjustable OPV (over pressure valve) that allows you to change the brewing pressure.