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12 Machine Espresso Facts To Inspire You To Look More Discerning Around The Cooler. Cooler
How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to create the coffee we love. What exactly is it?

To make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee but the major difference is in the pressure.

The Head of the Group

The group head is the portafilter that you place in the espresso maker when making it. It disperses the water into the portafilter, and regulates the pressure of the extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some are designed to provide the stability of temperature while some are built to handle pre-infusion. Some are designed to control the lever. Some are a combination, such as the E61. This is a very popular choice for baristas due to the fact that it has multiple advantages in a single package.

As you can see in the image above the group head comes with numerous notches that you can place your portafilter before twisting it by hand to secure it. There is also a gasket of rubber which is located inside the notches and helps create the seal when you insert your portafilter into the machine. The notches on the head allow for an exact positioning of the portafilter which is necessary for a consistent extraction.


The group head is not just able to allow you to insert your portafilter easily but also maintains the same temperature. This is achieved by cycling hot water around the portafilter, and through the brew basin, ensuring that the temperature is always at the right level for extraction. It is crucial to keep in mind that even a few degree deviation can make the difference between a decent and a great espresso.

The Pump

The motorized pumps used in espresso machines rotary provide nine atmospheric bars of pressure required for espresso extraction. This is different from manually operated piston machines that employ a lever. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are generally less expensive than piston-driven models, and they tend to last longer, but both types of machines could become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, which can increase the cost of even simplest models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The drawback is that the same boiler that produces steam also increases the temperature of water to the point of boiling which could lead to excessive extraction. They also have to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines employ either a rotary or vibration pump, which has a vibration model that uses a vibrating disc to generate the pressure and an rotary model that pushes hot water through the grounds at high speed. Both types of machine can make excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the part which heats the water to the optimal temperature for extraction. The steam produced is then directed to the portafilter, which is a container for espresso grounds. It is then pumped into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a crema on top of the espresso. This is a sign of a great espresso.

There are three kinds of espresso makers, which differ in the kind of pump they use and the degree of heat that the coffee is. There are a variety of ways that the brew may be controlled as well as the size of the cup the machine can produce.

The first espresso machines were steam types. They utilized a single boiler to make steam and brew, however, the pressure they could create was minimal - two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic one that has an electric pump. When mouse click for source think of espresso machines, they think of these machines. With a semi-automatic espresso machine, you grind the beans and tamp them by hand. However, the pump regulates the flow of water and pressure. This is an excellent combination of human control and mechanized consistency.

The Filter

Espresso machines typically have filters that separate the coffee grounds from the hot water. The filter is also an essential element of the machine's temperature control, since it stops overheating.

A filter can also help with flavor because it allows for an extended flowering time. This lets the beans release their flavors, and also allows 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 is crucial.

This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy that you use to put the coffee grounds in, when making espresso.

Steam-driven espresso machines use hot water that is heated inside an airtight container to create steam. The steam then pushes hot water into the grounds of coffee under high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. However, they are limited in their ability to create the perfect conditions for brewing, since they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent years, compressed-air-pump-driven espresso machines have become more popular. They utilize an air compressor to force hot water into the ground, and are more mobile than electric steam-driven espresso machines.