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How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the coffee we love. How exactly does it work?

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

The Group Head

The group head is the portafilter you insert when brewing espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are a variety of types of group head, each with their unique advantages and drawbacks. Some are specifically designed for stability of temperature while others are specifically designed to handle pre-infusion. Some are designed to control the lever. There are even some that have a combination of features, such as the E61, which is the most popular choice among baristas due to its ability to offer multiple perks in one package.

As you can see in the photo above, the group head has a number of notches. The portafilter is placed in these notches and then turn the head around to secure it. There is also a gasket made from rubber which is located inside the notches, which helps create an airtight seal after inserting your portafilter into the machine. The notches on the head permit an exact positioning of the portafilter which is crucial to ensure a consistent extraction.

The group head not only allows you to place your portafilter easily however, it also keeps an even temperature. It does this by cycling hot water through the brew basket and around the portafilter to ensure that it is always at the right temperature for extraction. This is important, as just a few degrees could make the difference between good and great espresso.

The Pump

In contrast to manual piston machines which rely on a lever to pressurize water, the rotary espresso machines use motorized pumps to provide the nine atmospheric bars of pressure necessary for espresso extraction. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically cheaper and last longer than piston-driven machines. However, both types of machines may degrade due to overuse and insufficient cleaning. Pumps are also more complicated mechanically, which can increase the cost of even simple models.

Some espresso machines can eliminate the pump completely and use steam pressure to brew espresso. This can result in over-extraction because the dual boiler espresso machine that produces steam also causes the water to boil. The machines must also constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines make use of a vibration or rotary pump, with a vibrating model that uses a vibrating disc to create the pressure and rotating models that push hot water through the grounds under high speed. Both types of machine can produce an excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats water to an optimal temperature to extract. The steam that is created gets to the portafilter which is a container for espresso grounds. The steam is then channeled into the cup. During this process the steam generates enough pressure to push the grounds of coffee through. This creates a layer crema that is then poured over. This is a sign of a good espresso.

There are three kinds of espresso makers; Triplexdirectory published a blog post,, and they differ in the type of pump they employ and how hot the espresso is. There are a variety of ways to control the amount of brew, as well as the size of the cup that can be produced by the machine.

The earliest espresso machines were steam-based. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern best espresso machine under 500 machine.

The most well-known espresso maker is a semiautomatic machine that has an electric pump. These are the images people have when they think of an espresso maker. With a semi-automatic machine, you need to grind the beans and tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent combination of human control and mechanised reliability.

The Filter

Espresso machines typically use a filter that separates the coffee grounds from the hot water. The filter is also a vital element of the temperature control system as it keeps the machine from overheating.

It also aids in flavor, since a filter allows for a more prolonged bloom time. This allows the beans to release their flavor and improves extraction.

It is important to keep in mind that even the finest filter can result in a bad cup of coffee. The quality of the beans and the extraction process remain crucial.

This is where the magic happens, and it's what makes espresso taste great. The grouphead (also called the brewhead) is where you put the portafilter, which is the thingy that you put the coffee grounds into, when making espresso.

Steam-driven best small espresso machine machines use hot water that is heated in an airtight container to create steam. The steam then pushes hot water into the grounds of coffee under high pressure. These kinds of machines tend to be cheaper and easier to maintain than pump-driven models. However, they are not as efficient in their capacity to create the ideal conditions for brewing since they are only operating at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

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