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Solutions To Issues With Machine Espresso
How Does Machine Espresso Work?

The machine espresso uses precise pressure, as well as a filtering technology that is amazing to create the coffee you love. How exactly does it work?

Espresso is made by pushing hot water under pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the main difference.

The Head of the Group

The group head is the portafilter you insert when brewing espresso. It distributes water into the portafilter, and then regulates the pressure of extraction. There are a variety of group heads, each with its own advantages and drawbacks. Some focus on temperature stability, others on pre-infusion options, and others are designed to control the lever. There are some that contain a variety of features, such as the E61, which is considered the classic choice among many baristas due to its ability to offer multiple benefits in a single package.

As you can see in the photo above the group head is made up of many notches in which you can place your portafilter and twist it manually to lock it in. There is also a rubber gasket which is located inside the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for an exact placement of the portafilter, which is crucial to ensure an efficient extraction.


The group head not only allows the portafilter to be inserted easily, but it also maintains an even temperature. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it is always at the right temperature for extraction. This is vital, because even a few degrees can mean the difference between excellent and great espresso.

The Pump

Contrary to manual piston machines that use a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger prior it is shot through the ground coffee in the group head.

Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, however both types of machines can degrade with overuse and insufficient cleaning. They also create mechanical complexity and can lead to the cost of even the simplest models.

Some espresso machines can eliminate the pump completely and use steam pressure to brew espresso. This could lead to over-extraction since the boiler that makes steam also heats the water to boil. In addition, these machines frequently have to restore their pressure between cups, which requires time and energy.

Many espresso machines make use of the rotary or vibration pump. A vibration model employs a rotating disk to generate pressure, whereas the rotary model pushes hot water through the ground at a fast speed. Both models can make a great espresso, but Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is what makes the water warm to the perfect temperature for extraction. espresso coffee machines that is produced reaches the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. The steam is able to create enough pressure to push the grounds of coffee through. This produces a layer of crema that is then poured over. This is one of the main characteristics of a great espresso.

There are three types of espresso machines, each having different pumps and brew temperature. There are various ways to control the amount of brew, as well as the size of cup that can be produced by the machine.

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

The most common espresso maker is a semi-automatic one that has an electric pump. When people think of espresso machines, they envision these machines. If you have a semi-automatic machine you must grind the beans and then tamp them by hand. However, the pump regulates the flow of water and pressure. This is a great combination of human control and mechanized consistency.

The Filter

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

It also improves flavor, as it allows for a more prolonged bloom time. This helps the beans release their flavors and provides the chance for better extraction.

It is important to keep in mind that even the most efficient filter can produce a bad cup of coffee. The quality of the beans, and the extraction process, remain vital.

It's in this area that the magic takes place. This is the reason why espresso tastes so delicious. The grouphead, often referred to as the brewhead, is where the portafilter (the device you put the ground coffee in) sits when you're making espresso.

Steam-driven espresso machines use hot water that is heated inside an airtight container to make steam. The steam then pushes hot water into the coffee grounds under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. However, they are not as efficient in their ability to provide the perfect conditions for brewing, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent times, espresso machines powered by a compressed air compressor have become increasingly popular. They utilize an air compressor to force hot water into the ground and are much more mobile than electric steam-driven espresso machines.