Breville BES920XL Dual Boiler Espresso Machine Dual stainless steel boilers and dual Italian pumps for simultaneous espresso extraction and steaming Over-Pressure Valve (OPV) limits extraction pressure;Flexible Shot Control Electronic PID temperature control for precise water temperature Backlit LCD displays brew temperature, shot clock or time.We recommend using cold, filtered water. We do not recommend using water with no or low mineral content Includes water hardness test strip, descale alert and LCD assisted descale procedure