Notes

Do You Think Machine Espresso One Day Rule The World?
How Does Machine Espresso Work?

The machine espresso is made using precise pressure and filter technology that is mind-blowing to create the coffee you enjoy. What exactly does it work?

Espresso is created by forcing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee. However, it is the pressure that makes the main difference.

The Group Head

As the name implies the group head is the place you place your portafilter while brewing espresso. It is responsible for dispersing water into the portafilter and controlling the pressure of the resulting extraction. There are a variety of types of group head each with its own advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion capabilities, and still others are designed to control the lever. There are even some that have a combination of features, like the E61 one, which is the standard choice for many baristas due to its ability to provide multiple benefits in one package.

As you can see in the above photo the group head is made up of several notches to put your portafilter, then twist it by hand to secure it. There is also a gasket made from rubber in the notches and helps create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential for an efficient extraction.

Aside from allowing you to easily place your portafilter in, the group head is responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew basket and around the portafilter, ensuring that it is always at the correct temperature to extract. It is important to realize that even a slight difference can make the difference between a good and a great espresso.

The Pump

The motorized pumps used in rotary espresso machines provide the nine atmospheric bar pressure that is required to extract espresso. This differs from manual piston machines that rely on a lever. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.


Pumps are generally less expensive and last longer than piston-driven machines. However, both types of machines may degrade due to overuse and poor cleaning. They also increase the complexity of mechanical systems and can lead to the cost of even the simplest models.

Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. The downside is that the same boiler that produces steam also raises the temperature of the water to boiling and can result in excessive extraction. These machines also have to continually rebuild their pressure between cups. This requires energy and time.

Many espresso machines utilize an rotary or vibrating pump, which has a vibration model using a rotating disc to create pressure and the rotary model pushing hot water through the grounds at high speed. Both types of machines can make excellent espresso, but Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part which heats the water to the optimal temperature to extract. The resulting steam reaches the portafilter containing the ground espresso coffee and is then pumped down into the cup. During this process, the steam creates pressure to push through the grounds of the coffee. This results in a crema on the top of the espresso. This is the hallmark of a great espresso.

There are three kinds of espresso makers. They differ in the type of pump they use and how hot the coffee is. There are a variety of ways to control the amount of brew, as well as the size of the cup that can be made by the machine.

The first espresso machines were steam-type. The first espresso machines were steam types. The coffee tasted bitter and burned. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic model with an electric pump. When small espresso machine think of espresso machines, they imagine these machines. If you have a semi-automatic machine you grind the beans and tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent compromise between human touch and mechanized consistency.

The Filter

Typically, espresso machines use a filter to separate out the grounds of the coffee as they go through the hot water. The filter is also an essential part of the temperature control system as it keeps the machine from overheating.

A filter also improves flavor because it allows for an extended flowering time. This lets the beans release their flavor and allows for better extraction.

It is important to remember that even the best filter can produce a bad cup of coffee. The quality of the beans, as well as the extraction, are still crucial.

This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead, often referred to as the brew head, is the place where the portafilter (the device you put the ground coffee into) sits when you're making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight vessel to create steam. The steam then pushes hot water through grounds of the coffee under pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. However, they are limited in their capacity to create the ideal brewing conditions, since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

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

Read More: https://www.coffeee.uk/categories/espresso-coffee-machines