![]() These machines work by using a lever to pressurize hot water and send it through a boiler to the ground beans. Piston-driven - A piston-driven machine was first developed in Italy by Achille Gaggia.What are the types of commercial espresso machines? This means that workers do not have to separately grind the coffee. Built-in grinder - A super-automatic commercial machine for espresso includes a grinder.This allows for different sized shots of espresso and for the production of other drinks made of coffee beans. Multiple group heads - Commercial machines have multiple group heads. ![]() The automation is accomplished with an in-line flow meter to the group head. The machine may be semi-automatic or fully automatic, allowing it to adjust the machine's pressure and volume.
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