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10 Machine Espresso Meetups You Should Attend
How Does Machine Espresso Work?

The machine espresso uses precise pressure and filtering system that is awe-inspiring to create the coffee you enjoy. What exactly does it work?

Espresso is produced by pushing hot water under high pressure through finely ground coffee. The process is similar to making drip coffee but the difference is in the pressure.


The Group Head

As the name implies, the group head is where you place your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the extraction. There are many different types of group heads, each with its own advantages and disadvantages. Some focus on temperature stability, some on pre-infusion capabilities, and still others are designed to control the lever. There are some that contain a variety of features, such as the E61 one, which is to be the most popular among baristas due to its capacity to provide multiple benefits in a single package.

As you can see in the photo above, the group head has many notches in which you can place your portafilter and twist it by hand to secure it. A gasket made of rubber is placed inside the notches to help make a seal when you insert your portafilter. The notches on the head permit a precise positioning of the portafilter which is essential to ensure an even extraction.

Apart from allowing you easily connect your portafilter, the group head is also responsible for maintaining an even temperature. This is accomplished by cycling hot water around the portafilter and through the brew-basket, ensuring that the temperature is at the right level for extraction. This is important because just a few degrees could be the difference between a excellent and great espresso.

The Pump

Unlike manual piston machines, which rely on a lever to pressurize water, the rotary espresso machines use motorized pumps that provide the nine atmospheric bars of pressure that are required to extract espresso. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven models, and they tend to last longer, however both types of machines can become damaged due to excessive use and poor cleaning. They also add mechanical complexity and can lead to the cost of even the most basic models.

Certain espresso machines can eliminate the pump entirely and use steam pressure to brew espresso. This can lead to over-extraction as the boiler that makes steam also causes the water to boil. The machines also need to continually rebuild their pressure between cups. This takes energy and time.

A large majority of espresso machines employ either a vibration or rotary pump. A vibration model uses the vibrating disk to create pressure, whereas a rotating model pushes hot water through the ground at a fast speed. Both types of machines are capable of producing excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is what heats the water to the ideal temperature for extraction. The steam produced will eventually reach the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. In this process, the steam causes pressure to push through the coffee grounds. This results in a layer of crema on top. This is one of the hallmarks of a great espresso.

There are three types of espresso machines, each having a different type of pump and brew temperature. There are various ways that the brew may be controlled as well as the size of the cup the maker can create.

The earliest espresso machines were steam types. They used a single boiler to make both brew and steam, however, the pressure they could create was minimal - two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used espresso maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanised consistency.

The Filter

Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also an essential component of the machine's temp control, since it stops overheating.

It also enhances flavor, as it can allow for a longer bloom phase. This allows the beans to release their flavors and provides an opportunity for better extraction.

However, it is important to keep in mind that even a high-quality filter can result in a poor cup of coffee, as the quality of the beans and extraction are vital.

portable espresso maker 's in this area that the magic takes place. This is what makes espresso taste so delicious. The grouphead, also referred to as the brewhead, is where the portafilter (the thingy you put the ground coffee in) is placed when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds at high pressure. These kinds of machines are typically less expensive and simpler to maintain than pump-driven models. They are however limited for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, espresso machines driven by compressed air-pump have become increasingly popular. They utilize an air compressor to force the hot water through the grounds and are much more portable than electric steam-driven machines.