Sage The Dual Boiler Espresso MachineSage The Dual Boiler Espresso Machine Commercial features and performance, in a domestic foot print. 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 third wave specialty