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How Does Machine Espresso Work?

Machine espresso uses precision pressure and amazing filter technology to make the coffee we love. But how exactly does it work?

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

The Head of the Group

The name implies the group head is the place you place your portafilter when making espresso. It disperses the water into the portafilter, and then regulates the pressure during the extraction. There are numerous kinds of group heads each with its own advantages and disadvantages. Some are specifically designed for stability of temperature while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some include a combination like the E61. This is a preferred choice for baristas because it offers multiple advantages in a single package.

As you can see in the image above, the group head has many notches in which you can place your portafilter before twisting it by hand to secure it. There is also a rubber gasket which is located inside the notches and helps to create a seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial to ensure an accurate extraction.

In addition to allowing you to easily place your portafilter in, the group head is also responsible to maintain an even temperature. It does this by cycling hot water through the brew container and around the portafilter to ensure that it's always at the correct temperature for extraction. It is important to realize that even a few degree differences can make the distinction between a great and a excellent espresso.

The Pump

In contrast 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 buy espresso makers. The pressure is created by removing tap water from a reservoir, and pumping it through a heat exchanger prior to being shot through the ground coffee inside the group head.

Pumps tend to be more affordable and last longer than piston-driven machines. However, both types of machines are susceptible to degrading due to excessive use and insufficient cleaning. Pumps are also more complex mechanically, which could increase the cost of even simplest models.

Some espresso machines employ steam pressure instead of a pump for brewing espresso. This can lead to over-extraction as the boiler that makes steam also heats the water to boil. These machines also have to constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines utilize the rotary or vibration pump, with a vibrating model using a rotating disc to generate the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both machines produce great espresso however rotary machines tend to be more stable, quieter and less likely to break.

The Boiler

The boiler is the component that heats water to the optimal temperature for extraction. The steam produced gets to the portafilter which is a container for espresso grounds. The steam is then channeled into the cup. The steam causes pressure to push through the coffee grounds. This creates a crema on the top of the espresso. This is the hallmark of a great espresso.

There are three distinct types of espresso machines, each having distinct pumps and brew temperature. There are also different ways that the brew can be controlled and the size of the cup the machine is capable of making.

The first espresso machines were steam-type. They used one boiler to make steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure at the most. This led to the coffee tasting burnt and bitter. This is why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most common espresso maker is a semi-automatic one that has an electric pump. These are what people imagine when they think of an espresso maker. With a semi-automatic machine, you have to grind the beans and tamp them by hand, but the pump regulates the flow of water and pressure. This is a fantastic solution that combines human control with mechanized reliability.

The Filter

espresso coffee machine home machines usually have filters that separate the grounds of the coffee from hot water. The filter is also an essential component of the temperature control system, since it helps prevent the machine from overheating.

Filters also aid in flavor since it allows for the beans to flower for a longer period of time. This allows the beans to release their nuances, and allows for better extraction.

It is important to remember that even the best espresso machine under 500; Get the facts, filter can make a bad cup of coffee. The quality of the beans, and the extraction, remain vital.

It's in this area that the magic occurs. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you put the portafilter - the thingy used to place the coffee grounds in, while making espresso.

Steam-driven espresso machines make use of hot water heated in an airtight container to produce steam. The steam then pushes hot water through coffee and espresso maker grounds under high pressure. These machines are cheaper and easier to maintain than pumps-driven models. They are however limited to create 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, compressed air-driven espresso machines have been gaining popularity. They utilize an air compressor to force hot water into the ground, and are more mobile than steam-driven electric espresso machines.