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How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How does it work exactly?

Espresso is made by pushing hot water under 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 you place in the espresso maker when making it. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the extraction. There are a variety of types of group head, each with their distinct advantages and disadvantages. Some focus on temperature stability, while others on pre-infusion capabilities, and still others are designed to control the lever. Some are a combination, such as the E61. This is a very popular choice for baristas as it provides a variety of benefits in one package.

As you can see in the picture above, the group head is equipped with several notches. It is possible to place your portafilter in these notches, then turn the head around to secure it. There is also a rubber gasket which is located inside the notches, which helps create a seal when you insert your portafilter into the machine. The notches permit the precise placement of the portafilter. This is essential for a consistent extraction.

In addition to allowing you easily place your portafilter in, the group head is responsible for maintaining an even temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it's always at the right temperature to extract. This is important, as even a few degrees can be the difference between a excellent and great espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever that pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure required for espresso extraction. The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger prior to it is shot through the ground coffee inside the group head.

Pumps tend to be less expensive than piston-driven machines and tend to last longer, but both types of machines may be damaged by excessive use and inadequate cleaning. They also create mechanical complexity that can lead to a high price tag on even the most basic models.

Certain espresso machines do away with the pump completely and instead use steam pressure to brew espresso. This could lead to over-extraction since the boiler that produces steam also heats the water until it comes to a boil. The machines also need to continuously rebuild their pressure between cups. This takes energy and time.

Many espresso machines utilize the rotary or vibration pump, with a vibration model using a vibrating disc to create the pressure, and rotating models that push hot water through the grounds under high speed. Both models can make excellent espresso, however 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 steam that is produced reaches the portafilter which holds ground espresso coffee makers beans and is then funneled down into the cup. The steam is able to create enough pressure to push the grounds of the coffee through. This creates a foam on top of the espresso. This is one of the hallmarks of a good espresso.

There are three kinds of espresso makers, and they differ in the type of pump they employ and the degree of heat that the cafe espresso machine is. There are many ways to control the brew and the size of cup that can be made by the machine.

The first professional espresso maker machines were steam-type. The earliest espresso machines were steam types. The coffee tasted bitter and espresso machines uk burnt. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most commonly used espresso maker is a semi-automatic device with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans on your own, but the pump regulates the water flow and pressure. This is a perfect solution that combines human control with mechanised reliability.

The Filter

Typically, espresso machines use filters to separate the grounds of coffee when they pass through the hot water. The filter is also an essential component of the machine's temperature control, as it helps prevent overheating.

It also enhances flavor, as a filter allows for a more prolonged bloom phase. This helps the beans to let their nuances out and provides an opportunity for a better extraction.

It is important to remember that even the most efficient filter can make a bad cup of coffee. The quality of the beans, and the extraction process remain vital.

It's here that the magic occurs. This is the reason why espresso tastes so good. The grouphead, also called the brew head, is where the portafilter (the thingy you put the ground coffee in) is placed when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to produce steam, which then pushes the hot water through the grounds with high pressure. These kinds of machines are generally less expensive and simpler to maintain than pumps-driven models. They are however limited in their ability to create the perfect 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 espresso machines have been gaining popularity. They utilize an air compressor to push hot water through the grounds and are much more portable than electric steam-driven machines.