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10 Undeniable Reasons People Hate Machine Espresso
How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the delicious coffee we enjoy. What exactly is it that makes it work?

To make espresso, hot water is forced 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 that you place in the espresso maker when making it. It distributes water into the portafilter, and then regulates the pressure of the extraction. There are various kinds of group heads, each with their own advantages and drawbacks. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Others are built to control the lever. Some have a combination of features, such as the E61 one, which is the standard choice for many baristas because of its ability to provide multiple benefits in one package.

As you can see in the above photo The group head features numerous notches that you can place your portafilter before twisting it with your hands to lock it in. A gasket of rubber is situated in the notches to create a seal while you insert your portafilter. The notches allow for precise placement of the portafilter. This is crucial for an efficient extraction.

The group head not only lets the portafilter to be inserted easily however, it also keeps a constant temperature. It does this by cycling hot water through the brew pan and around the portafilter to ensure that it's always at the correct temperature for extraction. This is vital, because even a few degrees can be the difference between a excellent and great espresso.

The Pump

Contrary to manual piston machines which rely on a lever that pressurize water, the rotary espresso machines use motorized pumps that provide the nine atmospheric bars of pressure necessary for espresso extraction. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically 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. They also increase the complexity of mechanical systems and can lead to an expensive price for even the simplest models.

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

Many espresso machines make use of the rotary or vibration pump. A vibration model uses an oscillating disk to create pressure, whereas the Rotary model pushes hot coffee through the ground at a high speed. Both types of machine can make a great espresso, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component which heats the water to the ideal temperature to extract. The steam that is produced gets to the portafilter which holds the espresso grounds. The steam is then channeled into the cup. During this process, the steam creates pressure and pushes through the grounds of the coffee. This results in a layer of crema on top. This is a hallmark of a good espresso.

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

The first espresso machines were steam-types. The first espresso machines were steam types. This led to the coffee tasting burnt and bitter. The modern espresso machine was developed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso maker is a semi-automatic machine that has an electric pump. These are the things people think of when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the flow of water and pressure. This is a great compromise between human control and mechanized accuracy.

best ground coffee for espresso machine use filters that separate the grounds of the coffee from the hot water. The filter is also an important part of the temperature control system as it prevents the machine from overheating.

Filters also aid in flavor as it allows for an extended flowering time. This lets the beans release their flavor and improves 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.

It's here that the magic takes place. This is the reason why espresso tastes so good. The grouphead, sometimes referred to as the brew head, is where the portafilter (the thing you put the ground coffee into) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight container to produce steam. The steam then pushes hot water through the coffee grounds under high pressure. These types of machines are usually less expensive and simpler 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 become more popular. They use an air compressor to force hot water through grounds and are much more portable than electric steam-driven machines.

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