In 1901 people saw their first glimpse of the espresso coffee machine. There have been several different variations since then. Most, however, include a few of the same basic parts. The portafilter, for example, which uses a small metal basket to hold the grounds. A steam wand on these coffee machines is pretty common as well. The steam wand steams the milk and then froths it for certain espresso based drinks.
There are several variations of the espresso machine as discussed below. Each have their own pros and cons and the usage is dependent upon what each person prefers.
Piston: The founder of the espresso machine maker Gaggia, Achille Gaggia, invented a piston driven version in Italy around 1945. Gaggia's version uses a handle and manual pumping action to push the heated water through the coffee grounds. The commonly used term, "pulling a shot", derives from the usage of this machine because of the need to pull the handle several times to complete the task. There are two different styles of the piston espresso machines. The manual version which works by the operator pushing the water through by way of the handle alone and the spring driven version that uses a tensioned spring to build up the pressure.
Pump: Pump style espresso coffee machines work off of a motorized pump. This pumps builds the force needed to brew the drink properly. This is the type of maker you will see most often in coffee shops because it gets the job done quickly. Commercial styles are hooked in to the buildings plumbing making them ideal for business use while cheaper versions that are normally used at home come with a built in water reservoir.
Steam: Steam driven espresso coffee machines are just as simple as they sound. Steam pressure builds to push the water through the coffee grounds and it is about as simple as that. The first espresso coffee machines created employed this type of functioning and because they require no moving parts are still used today because of the cheap manufacturing process.
Air Pressure: Air pressure espresso coffee machines are more commonly known as Handpresso makers. This name comes from the creater, Nielsen Innovation, who invented the product in 2006. It met fame in 2007 when it was first introduced in stores.
If you are looking to add an espresso coffee maker to your home or business you can see that you have a lot of options. The setting and frequency in which you will be using the coffee machine should be a big factor in your purchase decision. The price range on espresso machines are vast and brand and ability play a huge role in the sticker price. All will give you the same result in the end, great espresso drinks.
Source:http://texdigi.com/food/espresso-coffee-makers-developmental-history.html
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