Sage The Dual Boiler Black Truffle Espresso MachineSage The Dual Boiler Black Truffle Espresso Machine Commercial features and performance, in a domestic footprint. At the heart of this machine is its dual boiler heating system. The boiler, for the espresso shot, is PID temperature controlled, while a separate steam boiler offers instant and powerful steam on demand. So you can extract your shot at the right temperature, delivering optimal flavor, while simultaneously steaming your milk to cafe