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How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and a filtering system that is awe-inspiring to make the coffee you enjoy. How does it work exactly?

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

The Group Head

The name implies, the group head is the place you put your portafilter in when making espresso. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the resulting extraction. There are numerous kinds of group heads each with their own advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion features, and others are designed to control the lever. There are some that come with a range of features, like the E61, which is the standard choice for many baristas due to its ability to offer multiple benefits in a single package.

As you can see in the above image, the group head has several notches to place your portafilter before twisting it manually to lock it in. There is also a gasket made from rubber that resides inside the notches, which helps create a seal when you insert your portafilter into the machine. The notches permit precise placement of your portafilter. This is crucial for an accurate extraction.

The group head does not just allow you to place your portafilter easily however it also keeps a constant temperature. It does this by cycling hot water through the brew container and around the portafilter, making sure that it is always at the right temperature for extraction. This is important because even a few degrees can be the difference between a good and excellent espresso.

The Pump

The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines which use levers. The pressure is built by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven models, and they tend to last longer. However, both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, which can raise the cost of even the most basic models.

Some espresso machines eliminate the pump completely and make use of steam pressure to make espresso. This can lead to over-extraction as the boiler that produces steam also heats the water to boil. The machines must also continuously rebuild their pressure between cups. This takes energy and time.

A majority of espresso machines utilize the rotary or vibration pump. A vibration model utilizes the vibrating disk to create pressure, whereas a circular model pushes hot liquid through the ground at a fast speed. Both types of machine are capable of producing excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats the water to the ideal temperature to extract. The resultant steam then reaches the portafilter which holds the ground espresso coffee and gets funnelled down into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This creates a foam on top of the espresso. This is a hallmark of a great espresso.

There are three types of espresso makers. They differ in the kind of pump they use and the degree of heat that the brew is. There are various ways to control the strength of the brew and the size of the cup that can be produced by the machine.

The first espresso machines were steam-types. They had one boiler to create both brew and steam, however, the pressure they could produce was very low - just two bars of atmospheric pressure maximum. This resulted in the coffee tasting bitter and burnt. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern cheap espresso machine machine.

The most popular espresso machine is a semiautomatic with an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic machine, you have to grind the beans and then tamp them yourself but the pump controls the flow of water and pressure. This is an excellent solution that combines human control with mechanized accuracy.

The Filter

Espresso machines usually use a filter that separates the grounds of coffee from hot water. The filter is also a crucial component of the temperature control system, as it keeps the machine from overheating.

It also helps with flavor as a filter lets you enjoy a longer bloom time. This allows the beans to release their flavor and gives an opportunity to improve extraction.

However, it is important to remember that even a top filter can result in a poor cup of coffee as the quality of the beans and extraction is still crucial.

This is where the magic happens. It's what makes Italian Espresso Machines taste good. The grouphead (also known as the brewhead) is where you put the portafilter, the device which you put the grounds of coffee into when making espresso machine uk.

Steam-driven espresso machines make use of hot water heated in an airtight container to produce steam. The steam then pushes hot water through grounds of coffee under high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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