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Important Parts of an Espresso Machine A top espresso machine can make a shot of coffee with a firm body with a rich flavor, as well as an strong aroma. This requires high levels of pressure and temperature. You should also be aware of the crema, a golden-brown layer that gives an incredibly rich espresso its characteristic color and taste. There are four kinds of espresso machines, which include semi-automatic, manual and automatic. Water reservoir The reservoir for water is the container that stores the cold, filtered water that is fed to the espresso machine. It is usually movable and has a lid that keeps the water free of dust. It is an essential component of the espresso machine and must be kept clean to avoid getting blocked. To clean it, pour vinegar into the reservoir and let it run for a few minutes. The espresso machine uses water to pressurize the coffee grounds and extract the flavors, oils, and caffeine. It also creates the foam called crema. Achille Gaggia designed the first espresso machines that used pistons and levers to produce high-pressure coffee brewing. Gaggia's spring piston levers were used to push water through the coffee into the cup. This introduced a new jargon “coffee crème” (crema). The pump is an electrical device that moves the water through the heating element to heat it up to the ideal brewing temperature of 195 degrees Fahrenheit. It is usually located at the bottom of the machine and connected to a tubing that runs through the heating element. It also connects on both ends to the cold-water tube and the hot-water tube. It also runs under the heating element resistive, which is coated with white grease to keep the plate warm. Pump The pump is what makes espresso machine work and there are a variety of kinds. Certain machines utilize a vibratory pump or a vibratory pump that uses an electromagnetic motor that moves back and forth in the form of a coil at 60 pushes per sec. The pump then pushes water through the portafilter and out of the spouts. Other pumps use an energy source known as a thermoblock, or thermocoil, to heat the water precisely at the temperature required for brewing. These systems allow for the control of temperature and pressure, which is essential for a successful extraction. Pump-driven espresso machines can employ a spring, piston or electric pump. However, they all require that water be transported through the grounds of the coffee at a high pressure. The higher the pressure, more delicious the extraction. The pump makes sure that the coffee is evenly distributed and helps to make good crema. Other types of espresso machines include piston-driven or steam-driven. Steam pressure is used to force water through the grounds of coffee in a steam-driven espresso machine. This type of espresso machine is more affordable, but does not generate as much pressure for the extraction. There are also air-driven espresso machines that are lighter, smaller and do not require steam boilers. They can be powered via a hand-pump or canister with compressed air (such N2 or CO2). The espresso makers that are driven by air have lower pressure than pumps-driven espresso machines but may be more convenient for some. Steam Wand The steam wand is a thin metal pipe that shoots hot pressurized Steam into your milk for foamy drinks like lattes and cappuccinos. You can also make hot water for cocoa or tea. The wand typically has a few holes on the tip, which you can switch on and off to control the amount of steam released. Some machines have traditional wands, while others use a Pannarello wand, which is easier to use but does not create the same kind of foam that is required for Latte art. If you're having problems making your milk frothy, it could be that your espresso maker has a problem with its anti-vacuum device. This valve is designed in order to prevent air from getting absorbed into the steam wand when it is in operation. You can test this by lowering the wand, and listening for a sound that screams. If you hear a hissing sound it is a sign that air is being drawn into. It is recommended to raise the wand to submerge it fully. You can also test the anti-vacuum by taking off the wand and then cleaning it in warm water using a soft bristled sponge or brush. Cleaning the wand is essential to avoid clogs which could impact the frost. If you are unable to fix it yourself, you can consult a technician or a manufacturer. Control panel The control panel of an espresso machine allows users to configure and alter settings. Included are the coffee strength and the quantity of milk. The settings can be modified at anytime. The display displays when the machine must be descaled, and when the reservoir of water is full. Most espresso machines have hot water dispensers, either adjacent to one of the groups, or between them. It can be used to make hot cups or tea, if necessary. It can also be used to clean and rinse. There are many models with pressure gauges on the front of the machine, which indicate the current pressure of the boiler. There is also a brew switch which controls the brew cycle and the number of shots. This is important because espresso shot size is determined by the length of time that the grounds are in contact with the water. If desired the switch could be used to begin the steaming process. The control system on this espresso machine feels a bit old-fashioned, but it provides easy-to-use functions. It features a narrow LCD screen that appears like an LED. It is easy to navigate through the menus. However there is a small learning curve for those who are new to using espresso machines. The ability of the machine to keep a constant temperature is impressive. It ensures a perfect water temperature of 194deg – 208deg F throughout the entire making process. This guarantees a perfect aroma extraction and a premium cup every time.