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How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to create the perfect cup of coffee. What exactly is it that makes it work?

In order to make espresso, hot water is pushed under 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 Head of the Group

The group head is the portafilter that you put in when making espresso. It disperses the water into the portafilter, and then controls the pressure of the extraction. There are numerous kinds of group heads, each with its own advantages and disadvantages. Some are specifically designed for temperature stability while others are built to handle pre-infusion. Others are made to control the lever. There are some that have a combination of features, such as the E61, which is considered to be the most popular among baristas for its ability to offer multiple perks in one package.

As you can see in the image above The group head features several notches to place your portafilter and then twist it manually to secure it. There is also a rubber gasket that is a part of the notches and helps to 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 necessary for a consistent extraction.

The group head not only lets you to place your portafilter easily however, it also keeps a constant temperature. This is achieved by cycling hot water around the portafilter and through the brew-basket, ensuring the temperature is always right for extraction. It is important to note that even a few degree deviation can make the difference between a good and a great espresso.

The Pump

The motorized pumps used in rotary espresso machines provide the nine atmospheric bars of pressure required for espresso extraction. This is different from manual piston machines that use levers. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are generally more affordable and last longer than piston-driven machines. However, both kinds of machines are susceptible to degrading because of frequent use and inadequate cleaning. Pumps are also more complicated mechanically, and can add to the price of even the simplest models.

Some espresso machines use steam pressure instead of a pump to make espresso. The drawback is that the same boiler that produces steam also increases the temperature of water to the point of boiling, which can lead to excessive extraction. Additionally these machines are often required 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 that uses a vibrating disc to create pressure, and the rotary model pushing hot water through the grounds at high speed. Both machines can make great espresso, but rotary machines are quieter, more durable and less likely to break down.

The Boiler

The boiler is what heats the water to the perfect temperature for extraction. The steam that is produced gets to the portafilter which holds the espresso grounds. The steam is then channeled into the cup. The steam creates enough pressure to push the grounds of the coffee through. This results in a layer crema that is then poured over. This is a sign of a good espresso.

There are three types of espresso machines, each with different types of pumps and brew temperature. There are various ways to control the brew as well as the size of cup that can be produced by the machine.

The first espresso machines were steam-type. The earliest espresso machines were steam types. This led to the coffee tasting bitter and burnt. The modern professional espresso machine for home machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic one with an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic machine, you have to grind the beans and then tamp them by hand. However, the pump is able to regulate the flow of water and pressure. This is a fantastic compromise between human control and mechanised consistency.

The Filter

Espresso machines typically use a filter that separates the grounds of the coffee espresso machines from the hot water. The filter is also a vital component of the machine's temp control, as it prevents overheating.

A filter also helps with flavor because it allows for an extended flowering time. This helps the beans release their flavors and provides an opportunity for a better extraction.

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

It's here that the magic takes place. This is the reason why cafe Espresso machine tastes so good. The grouphead (also called the brewhead) is where you place the portafilter, the device that you put the grounds of coffee into when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight tank to create steam, which is then pushed through the grounds with high pressure. These types of machines are typically cheaper and easier to maintain than pump-driven models. They are however limited to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, compressed air-pump-driven espresso machine sale machines have been gaining popularity. They use an air compressor to push hot water through the ground and are much more mobile than electric steam-driven espresso machines.