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This Week's Best Stories About Machine Espresso
How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and amazing filter technology to make the coffee we love. How exactly does it work?

To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee but the key difference is in the pressure.

The Group Head

The group head is the portafilter that you place in the espresso maker when making it. It disperses water in the portafilter and regulates the pressure during the extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some are designed to provide stability of temperature while others are 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 that is the classic choice among many baristas due to its ability to provide multiple benefits in a single package.

As you can see in the photo above, the group head is fitted with a variety of notches. The portafilter is placed into these notches and twist the head to secure it. There is also a rubber gasket which is located inside the notches to help create a seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is vital for an accurate extraction.

espresso coffee machine allows you to place your portafilter easily but also maintains the same temperature. It does this by circulating hot water through the brew pan and around the portafilter to ensure that it's always at the right temperature for extraction. It is crucial to keep in mind that even a tiny difference can make the difference between a good and great espresso.

The Pump

Motorized pumps in rotary espresso machines provide the nine atmospheric bar pressure that is required for espresso extraction. This differs from manual piston machines that rely on levers. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be less expensive than piston-driven machines, and tend to last longer, but both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can raise the price of even the simplest models.

Some espresso machines employ steam pressure instead of a pump to make espresso. This can result in over-extraction because the boiler that produces steam also heats the water to boil. These machines also have to constantly rebuild their pressure between cups. This takes energy and time.

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

The Boiler

The boiler is what will heat the water to the perfect temperature for extraction. The resulting steam is then transferred to the portafilter that contains ground espresso beans and gets funnelled down into the cup. During this process, the steam causes pressure to push through the grounds of the coffee. This results in a whipped-up the top of the espresso. This is one of the main characteristics of a great espresso.

There are three kinds of espresso machines, each with distinct pumps and brew temperature. There are different ways in which the brew could be controlled, as well as the size of the cup the machine can make.

The first espresso machines were steam-types. The first espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most popular espresso maker is a semiautomatic machine that has an electric pump. This is what people envision when they think of an espresso maker. With a semi-automatic espresso machine, you have to grind the beans and then tamp them yourself but the pump provides regulated water flow and pressure. This is a perfect compromise between human control and mechanised accuracy.

The Filter


Typically, espresso machines employ filters to separate the grounds of coffee when they pass through the hot water. The filter is also a crucial part of the temperature control system as it keeps the machine from overheating.

It also improves flavor, as it allows for a longer bloom time. This helps the beans release their nuances and gives an opportunity to improve extraction.

However it is crucial to remember that even a great filter could result in a bad cup of coffee, because the quality of the beans and extraction is still vital.

It's in this area that the magic happens. This is what makes espresso taste so good. The grouphead, sometimes called the brew head, is the place where the portafilter (the container you place the coffee ground into) sits when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. Steam then pushes the hot water through the grounds at high pressure. espresso machine uk are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited for creating the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

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

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