To obtain the right characteristics of real espresso, the coffee machine must comprise the following components: PUMP ensuring a water PRESSURE of 9 bar through the coffee BOILER in which circulating water (for production of hot water and steam) can be heated to 90°C and water/coffee heat exchangers BREWING HEADS with filter holders for 7 / 14 g coffee; PROFESSIONAL MACHINES Automatic or semiautomatic with 1-2-3-4 brewin heads. COMPACT MACHINES Automatic or semiautomatic with 1-2 brewing heads. LEVER-OPERATED MACHINE Manually operated, can be used without electric energy. 1-2-3-4 brewing heads. SUPER-AUTOMATIC MACHINES Espresso machines with automatic control o grinding, dosing, pressing and brewing. FAMILY MACHINES Designed for domestic use, fitted with oscillating pump.