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12 Companies Setting The Standard In Machine Espresso
How Does Machine Espresso Work?

Machine espresso employs precise pressure and amazing filter technology to make the coffee we love. What exactly is it?

To make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, but the major difference is in the pressure.

The Head of the Group

The group head is the portafilter is inserted when you are making espresso. It is responsible for dispersing water into the portafilter and then controlling the pressure of the resulting extraction. There are several different types of group heads, each with their distinct advantages and disadvantages. Some are specifically designed for stability of temperature while others are built to handle pre-infusion. Others are built to control the lever. Some come with a range of features, such as the E61, which is to be the most popular among baristas for its ability to offer multiple benefits in a single package.

As you can see in the photo above the group head comes with several notches to place your portafilter and then twist it with your hands to secure it. There is also a gasket made from rubber in the notches, which helps create the seal when you insert your portafilter into the machine. The notches on the head allow for a precise position of the portafilter which is necessary for an even extraction.

The group head not only lets you to put in your portafilter easily however it also keeps the temperature at a constant level. It does this by circulating hot water through the brew pan and around the portafilter to ensure that it is always at the right temperature to extract. It is important to realize that even a tiny differences can make the distinction between a good and a excellent espresso.

The Pump

Unlike manual piston machines, which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure needed to extract espresso. 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, although both types of machines can degrade with overuse and insufficient cleaning. They also create mechanical complexity, which can result in costly prices for even the simplest models.


Some espresso machines employ steam pressure instead of a pump for brewing espresso. This can result in over-extraction because the boiler that makes steam also causes the water to boil. They also have to continuously rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of either a vibration or rotary pump. A vibration model makes use of the vibrating disk to create pressure, while a circular model pushes hot liquid through the ground at a fast speed. Both machines can make great espresso, however rotary machines are quieter, more durable and less likely to break.

The Boiler

The boiler heats the water to the perfect temperature for extraction. The resulting steam reaches the portafilter, which contains ground espresso beans and is then pumped down into the cup. During this process the steam creates enough pressure to push the grounds of coffee through. This produces a layer of crema on top. This is one of the hallmarks of a great espresso.

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

The first espresso machines were steam-type. They employed a single boiler to make both steam and brew, but the pressure they could produce was very low - just two bars of atmospheric pressure at most. The coffee tasted bitter and burned. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso machine is a semiautomatic that has an electric pump. These are the things people think of when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans on your own, but the pump regulates the flow of water and pressure. This is an excellent solution that combines human control with mechanized accuracy.

The Filter

Espresso machines typically use filters that separate the grounds of coffee from hot water. The filter is also an important component of the temperature control system, as it prevents the machine from overheating.

A filter can also help with flavor, as it permits an extended flowering time. This allows beans to release their nuances and gives an opportunity for a better extraction.

It is important to keep in mind that even the finest filter can result in a bad cup of coffee. The quality of the beans and the extraction process, remain vital.

This is where the magic happens, it's the thing that makes espresso taste good. The grouphead, sometimes referred to as the brewhead, is where the portafilter (the container you place the ground coffee into) is located when you're making espresso.

Steam-driven espresso machines use hot water that is heated inside an airtight container to make steam. click here for more info pushes hot water through the grounds of coffee under high pressure. These types of machines are typically less expensive and easier to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump have become increasingly popular. They use an air compressor to force hot water into the ground, and are more mobile than electric steam-driven espresso machines.

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