When you have decided to purchase a semi-automatic espresso machine, you have to consider these several points: Heating Technology, Portafilter and Grouphead.

Firstly, we should take note about the pumps found on espresso machines. Many times, you will notice that there are many espresso machines with 15-bar or 18-bar pumps and this typically should be disregarded. Majority of the espresso makers are using similar stock pump which are made by the company, Ulka. Its vibration pumps are reliable and rarely fail. But the maximum pressure would be meaningless, because quality espressos are best extracted around 8 to 10 bars at the grouphead. Pressure is regulated by an Over Pressure Valve that “bleeds” the water away lowering the pressure.

That is why some of the semi-commercial espresso machines are using rotary vane pumps. By using rotary vane pumps than vibration pumps, it will create less noise to operate, robust, and users can control the brew pressure by altering the built-in screw.

HEATING TECHNOLOGIES – Thermoblocks, Single Boilers, Double Boilers and Heat Exchangers

Thermoblocks – generally a heating component which “flash heats” water. The water is drawn from cold water chamber and go through the heated thermoblock, delivering on demand. The thermoblock steaming is achieved when the temperature is raised even higher on the device and getting the pump to deliver small water bursts which are again go through its thermoblock, then heated in to steam.

The advantage of a thermoblock is that it can heat up really fast and steam or espresso production would not be limited because the thermoblock is often hot. A major disadvantage of a thermoblock system is that, the temperature is rather unstable due to the small thermal mass. The extraction temp from thermoblock systems could widely vary and steam produced is commonly quiet wet as well.

Semi automatic espresso machine which uses thermoblocks are Cuisine Art, Breville, Delonghi, Krups and other entry machines.

Learn more about the best espresso machine for home: http://coffeemakerpicks.com/home-espresso-machines/

Single Boilers – made of aluminum, brass or stainless steel. It serves 2 purposes: the steam production and espresso extraction. It draws the water from the water reservoir and heats water to a set temp. If steam is required, its heating component will heat the water further and creates pressure in the boiler. Steam will be released by opening the valve that travels through the steaming wand. All are mechanical and no need for pump in steam production.

The advantages of a single boiler are the temp stability when extracting espressos, and an improved steam due of a dryer steam. While the disadvantages are the down time between switching from the extraction of espresso and producing steam (the time for water to boil and cool)

Some examples of espresso machines that feature single boilers are Rancilio, Gaggia and Lelit.

Continue reading about the Double Boilers and Heat Exchangers: http://www.idrinkcoffee.com/Articles.asp?ID=163

Coffee is the world’s most popular beverage. Coffee is the first thing that most people are looking first thing in the morning. Coffee is not just an energy booster, but it also contains essential antioxidants that cleanses or system from impurities. Coffee makers are a great machine that will allow you to prepare coffee fast and easy.

As there are numerous coffee makers in the market, it is a must to find the right one that offers the features that you are looking for coffee makers. Apart from the features of coffee machines, it is also imperative to know the heating components of coffee makers. This is important information that you need to determine in order to own the right coffee maker.

Coffee makers has resistive heating element or coiled wire, which is alike to light bulb’s filament or electric toaster that will gets hot once you turn on the machine. The heating components of coffee makers have two tasks. First, when you put water into the coffee maker, the heating element warms it. Second, after the machine has processed the coffee, the heating element will keep it warm.

The resistive heating element of coffee maker is located between the aluminum water tube and warming plate. The heat-conductive grease is another significant element that assures that the heat will be efficiently transferred. The grease on the other hand is very messy, which is quite difficult to remove by the fingers. This grease is primarily available in various appliances such as power supplies, stereo amplifiers and others.

Coffee machine has two switches one for turning off and one for turning off. To assure that the heating element not to overheat, components like fuses and sensors are installed. In coffee machines, sensors can detect if the coil is too hot and turn the current off. When it settles down, the current will return again. By this cycle, it allows you to have a warm coffee whenever you want to drink, so that no need for you to re-heat the coffee again and again. Fuses cut the power if the temperature is already too high. Fuses and sensors are two important elements that assure safety.

As read in many coffee maker reviews another significant aspect of a coffee machine is one-way-valve. Primarily, it is usually located in the aluminum heating pipe or the hold within the bucket. Without this, the water will rise-up. This is useful to maintain the water while boiling. This is an essential element that will allow the coffee maker to be safe. These are samples of the best drip coffee makers of today, see a list of Best Rated Coffee Makers to pick your favorite coffee machine.

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