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5 Laws That Can Benefit The Machine Espresso Industry
How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering technology that is amazing to create the coffee you enjoy. How does it work exactly?

Espresso is produced by pushing hot water under 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 Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It disperses the water into the portafilter, and controls the pressure of the extraction. There are numerous kinds of group heads, each with its own advantages and disadvantages. Some are designed for stability of temperature while others are designed to handle pre-infusion. Others are built to control the lever. Some have a combination, such as the E61. This is a preferred choice for baristas because it offers multiple advantages in a single package.

As you can see from the above photo the group head is equipped with several notches. You place your portafilter in these notches and then twist the head to secure it. A gasket of rubber is situated inside the notches, which helps create a seal as you insert your portafilter. The notches on the head allow for an exact placement of the portafilter, which is crucial for a consistent extraction.

In addition to allowing you easily place your portafilter in, the group head is responsible to maintain an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is always at the right level to extract the coffee. small espresso machine is important, as just a few degrees could make the difference between a excellent and great espresso.

The Pump

Motorized pumps in rotary espresso machines provide the nine atmospheric bar pressure that is required for espresso extraction. This is different from manual piston machines that use a lever. The pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger before being shot through the ground coffee in the group head.

Pumps tend to be less expensive than piston-driven models, and they tend to last longer, although both types of machines can get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, which could increase the price of even the simpler models.

Some espresso machines employ steam pressure instead of a pump in order to brew espresso. This could lead to over-extraction since the boiler that makes steam also warms the water to boil. In addition the machines often have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines utilize the rotary or vibration pump, which is a vibration model using a rotating disc to generate the pressure, and a rotary model pushing hot water through the grounds under high speed. Both models can make excellent espresso, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element which heats the water to the ideal temperature to extract. The resulting steam reaches the portafilter that contains ground espresso beans and is then pumped into the cup. During this process, the steam creates pressure that pushes through the coffee grounds. This results in a crema on the top of the espresso. This is one of the main characteristics of a great espresso.

There are three kinds of espresso makers, which differ in the type of pump they employ and how hot the espresso is. There are various ways that the brew may be controlled, as well as the size of the cup that the machine can make.

The first espresso machines were steam-types. They had one boiler to make steam and brew, however the pressure they were able to generate was low - only two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used 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 espresso machine, you grind the beans and then tamp them by hand. However, the pump controls the flow of water and pressure. This is a perfect combination of human control and mechanized accuracy.

The Filter

Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also a vital element of the machine's temperature control, since it helps to prevent overheating.

A filter also improves flavor as it allows for a longer flowering period. This allows beans to release their nuances and gives the chance for better extraction.

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


This is where the magic happens, it's what makes espresso taste great. The grouphead, often called the brewhead, is where the portafilter (the thingy you put the ground coffee in) sits when you're making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to make steam. The steam then pushes hot water into the coffee grounds under high pressure. These kinds of machines are usually less expensive and simpler to maintain than pump-driven models. They are however limited in their ability to create the perfect conditions for brewing since they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

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