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How Does Machine Espresso Work?

The machine espresso uses precise pressure and filter technology that is awe-inspiring to create the coffee you love. What exactly is it that makes it work?

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

The Group Head

The group head is the portafilter you insert when brewing espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure that results from the extraction. There are a variety of types of group head, each with their unique advantages and drawbacks. Some are specifically designed for stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. There are some that include a mix of features, like the E61, which is considered the classic choice among many baristas due to its capacity to offer multiple benefits in one package.

As you can see in the photo above the head of the group is fitted with several notches. The portafilter is placed in these notches, then twist the head to secure it. There is also a rubber gasket in the notches, which helps create a seal when you insert your portafilter into the machine. The notches on the head permit a precise positioning of the portafilter which is vital for an even extraction.

Apart from allowing you effortlessly insert your portafilter the group head is also responsible to maintain an even temperature. It does this by circulating hot water through the brew basket and around the portafilter, making sure that it's always at the correct temperature to extract. It is important to remember that even a few degree variation can mean the difference between a good and excellent espresso.

The Pump

In contrast to manual piston machines which rely on a lever that pressurize water, Rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure required to extract espresso maker barista. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger before being pushed through the ground coffee in the group head.

Pumps are generally less expensive than piston-driven machines, and tend to last longer, but both types of machine can degrade with overuse and insufficient cleaning. They also create mechanical complexity that can lead to costly prices for even the most basic models.

Some espresso machines use steam pressure instead of a pump in order to brew espresso. The disadvantage of this is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling, which can lead to over-extraction. In addition these machines typically have to rebuild their pressure between cups, which takes time and energy.

Many compact espresso machine machines employ an rotary or vibrating pump, which has a vibration model using a rotating disc that generates the pressure and the rotary model pushing hot water through the grounds at high speed. Both models can produce an excellent espresso, but the rotary pumps 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 steam produced reaches the portafilter, which is the container that holds the espresso coffee grounds. It is then pumped into the cup. The steam is able to create enough pressure to push the coffee grounds through. This results in a whipped-up top of the espresso. This is one of the hallmarks of a great espresso.

There are three kinds of espresso machine coffee makers, which differ in the type of pump they employ and how hot the brew is. There are different ways that the brew may be controlled and the dimensions of the cup the maker can create.

The first espresso machines were steam type. They had a single boiler to make both steam and brew, however the pressure they were able to produce was very low - just two bars of atmospheric pressure at most. This led to the coffee tasting bitter and burnt. This is the reason why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

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

The Filter

Typically, espresso machines utilize filters to separate the coffee grounds as they pass through the hot water. The filter is also a vital component of the machine's temperature control, as it prevents overheating.

It also aids in flavor, as it can allow for a longer bloom phase. This allows beans to let their nuances out and provides an opportunity for better extraction.

It is important to keep in mind that even the best filter could result in a poor cup of coffee. The quality of the beans and the extraction process are still very important.

This is where the magic happens. It's what makes an espresso really taste great. The grouphead, also referred to as the brew head, is the place where the portafilter (the container you place the coffee ground into) is placed when you're making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam. Steam then pushes the hot water through the grounds at a high pressure. They are less expensive and easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect 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 ground, and are more mobile than electric steam-driven espresso machines.