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Important Parts of an Espresso Machine A quality espresso machine must deliver a strong and thick-bodied shot of coffee, with a full-bodied flavor and intense aroma. This requires high temperature and pressure. It is also important to be aware of the crema, a golden-brown layer that gives a rich espresso its distinctive flavor and color. There are coffeee.uk of espresso machines, including manual, semi-automatic and automatic. Water reservoir The reservoir for water is a container in which you can store filtered, cold water that is then fed into the espresso machine. It is usually movable and has a lid that keeps the water clean and free of dust. It is an essential component of an espresso maker and should be kept clean in order to prevent getting blocked. To clean it, you can add vinegar to the reservoir and let it run for some time. The espresso machine uses water to pressurize coffee grounds and extract flavors, oils and caffeine. It also produces crema, the foam. The first espresso machines were invented by Achille Gaggia and used pistons connected to levers to create high-pressure coffee. Gaggia's spring piston levers were used to push water through the coffee into the cup. This created a brand new jargon “coffee crème” (crema). The pump utilizes electricity to push water through the heating element in order to heat it to the ideal temperature for brewing of 195 degrees Fahrenheit. It is usually located at the bottom of the machine, and is connected to a tube which runs up to the heating element. The tube is connected at both ends to both the cold-water and hot-water tubes. It also goes under the resistive heating element, which is covered in white grease to keep the plate warm. Pump The pump is what makes an espresso machine work and there are a variety of kinds. For instance certain machines use vibration or a vibe pump, which uses an electromagnetic machine that moves back and forth within the coil to produce 60 pushes per second. The pump forces water into the portafilter and then out of the spouts. Some pumps utilize the heating system known as the thermoblock, or thermocoil, which heats the water precisely at the temperature that is required for the brewing. These systems permit the control of water temperature and pressure, both of which are crucial for a good extraction. Pump-driven espresso machines may employ a piston, spring or electric pump. But, 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 also ensures that the coffee grounds are evenly dispersed, which helps make a good crema. Espresso machines that are piston-driven or steam-driven are also available. In a steam driven machine, the water is pushed through the coffee using steam pressure. This type of machine is cheaper however it does not provide the same amount of pressure to extract. There are also air-pump-driven espresso machines which are smaller and lighter but do not require a boiler. They can be powered by hand pumps or a canister filled with compressed air (such as N2 or CO2). Pump-driven espresso makers use less pressure than pump-driven espresso machines but may be more suitable for some. Steam wand The steam wand is the thin metal pipe that is inserted out of the espresso maker and shoots hot, pressurized steam into your milk, resulting in foamy drinks such as cappuccinos and lattes. You can also use the wand to create hot water for cocoa or tea. The wand generally has several holes on the tip, that you can turn off and on to regulate how much steam is released. Some machines come with an old-fashioned wand, while others come with a Pannarello that is simpler to use, but doesn't make foam that is suitable for latte arts. If you're experiencing problems with in frothing milk, it might be that your espresso machine is having issues with its anti-vacuum device. The valve was designed in order to prevent air from being absorbed by the steam wand as it is in operation. You can test this by lowering the wand, and watching for a hissing sound. If you hear a hissing sound it is a sign that air is being drawn in. You need to raise the wand a little to allow it to sink completely. You can also test the anti-vacuum using the wand and washing it in warm water using a soft bristled brush or sponge. It is crucial to keep the wand clean to avoid clogging which could affect your frost. If you are unable to resolve the issue on your own, then you can always contact a professional technician or the manufacturer for assistance. Control panel The control panel allows users to alter and configure settings. The settings include the strength of the coffee and milk quantity. These settings are saved in memory and can be changed at any time. The display indicates when the machine must be descaled and also when the reservoir for water is full. The majority of espresso machines have hot water dispensers. This is usually found in between or next to the groups. It can be used to make hot tea or to heat cups when needed. It is also useful to clean and rinse. Many models feature pressure gauges that display the current pressure of the boiler. A brew switch is also available, that controls the brew cycle as well as the amount of shots. This is crucial since the size of the espresso shot is determined by the length of time the grounds are in direct contact with the water. The switch can also be used to initiate the steaming process should you wish. The control system of this espresso machine is a bit old-fashioned, yet it provides easy-to-use functions. It has a slim LCD that feels more like a simple LED. It is easy to navigate through the menus. However there is a small learning curve for those new to espresso machine use. The machine's ability to maintain an unbeatable temperature is remarkable. The machine keeps a perfect water temperature between 194deg and 208deg F throughout the entire brewing process. This allows for perfect aroma extraction and ensures an even, high-quality, consistent cup each time.