How to Use a Commercial
Espresso Machine?

Most modern espresso machines rely on an electric pump to generate pressure.

A pressure of roughly 9 bars (130 psi) is needed for each espresso shot. This is nine times the atmospheric pressure at sea level (9 bar). 

For example, a PSI of 30 to 35 is recommended for the majority of the automobile tires.

Commercial espresso machines often require a sophisticated rotary pump to maintain constant pressure. This type of pump utilizes a mechanical disc rotating under the influence of electrical current. A typical household appliance is a vibration pump, which utilizes an electromagnetic coil to push and pull a piston.

The Heater
After the pump moves the water forward, the temperature can be raised. This is just as important as water supply and pressure.

In an espresso machine, the boiler is responsible for boiling the water in the system, as you might anticipate. Professional machinery frequently use a two-boiler setup. In other words, they have a brewing boiler and a steam wand boiler.

Two boilers handle the issue of having various temperature needs. Brewing water should be at 93°C (200°F), while steam should be at 100°C (212°F).

Inconsistencies in extraction rate, which are influenced by water temperature, might alter the flavor of the shot.

Proportional integral-derivative (PID) temperature controls have been added to espresso machines by a number of manufacturers. For optimal boiler temperatures, these handy devices connect to the heating element and control on/off cycles. If you don't have this technology, your espressos will have unpredictable heat levels.

The majority of espresso machines also include a steam wand. This is the espresso machine's side-mounted narrow metal nozzle. Using this thin hose, the steam wand directs hot steam from one of the two boilers into the milk. In order to make cappuccinos and lattes, milk must be heated and textured by pressurized steam.

The Group Head & Portafilter
These two components come into contact with one another at this point before it reaches your cup.

Group heads come in a variety of shapes and sizes, but they all share the same basic features. This is where the portafilter — the metal basket that holds the ground coffee – is. There is a portafilter lock, a pressure switch (to control boiler pressure), and a path for water flow through the group head.

There is no comparison between espresso machines and other types of devices, such as pod machines or filter machines. "They basically brew different beverages with varying concentrations."

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Other Questions about Coffee


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OCM was started in 2007, focusing first on coffee machines, then marketing for coffee and food and beverage companies. Check out this restaurant marketing guide to learn more about the many campaigns and companies we have worked with. 

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