The single brewing head on the Astra GS022-1 semi-automatic espresso machine produces as many as 180 cups per hour. Its boiler has a 4.2-liter capacity and includes a water connection to enable automatic refilling. To facilitate emptying, it's fitted with a drain. The vacuum valve stops milk from entering the boiler, and because the unit is semi-automatic, baristas can extract an ideal shot of coffee.The Astra GS022-1 espresso machine is equipped with one manual steam valve and one manual hot water valve. To ensure precise temperatures, it operates using a thermo-circulation brewing system. The flare fittings are made of strong brass, and the unit is constructed of stainless steel that's durable enough to handle long-term use. Overall, this machine measures 13 inches wide by 20 inches deep by 17 inches high.Gourmet Series Espresso/Cappuccino Machine, semi-automatic, (1) brewing head, (1) manual steam valve, (1) manual hot water valve, water connection & drain, 180 cups/hour, 4.2 liter boiler, rotary Procon® pump, thermo circulation brewing system, automatic water fill, vacuum valve, pre-infusion capabilities, brass flare fittings, stainless steel, 110v/50/60/1-ph, 20 amps, 2000 watts, NEMA 5-20P, UL STD 197, CSA 222.2 No. 109, ETL-Sanitation to NSF-4, Made in USA*Image may not depict product color, inclusions or accessories. Important Prop 65 information for California residents.