group head 

 December 5, 2016

By  Dorian Bodnariuc

A group head is a component of an espresso machine. A grouphead is the receiver for the removable portafilter, and it is composed of the shower and the portafilter.

A consumer espresso machine has only one grouphead, while professional machines, used in commercial coffee shops, can contain up to seven groupheads. 

 Located on the front of the machine, the group head is a metal, permanent attachment that brings water out of the machine and into the filter basket. 

The most famous group head is the E61, which was used in many espresso machines. This changed and many espresso machine manufacturers started to manufacture their own group heads.

The group head is often simply known as the group. Hot water is forced through the group head under pressure. The group head contains many tiny holes, known as the shower. The shower then attempts to distribute pressurized water evenly over the ground coffee bed. If coffee is ground unevenly, this won’t be possible and the result will be an uneven extraction.

It is important that group heads are maintained, to avoid regularly having to fix or replace them. Good practices include back-flushing the espresso machine, which consists of running water through the machine to wash coffee grinds away, as well as making sure the seals for the group head are in good condition.

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About the author

My name is Dorian and I am a former barista. I consume coffee in any form, as a beverage, in savory recipes and desserts. My favorite caffeinated beverage is the espresso.

I love to share my coffee brewing knowledge and my geeky coffee research. This blog is one of the places I write about coffee. More about Dorian... If you want to learn more about this site and how I started it, check our About Me page, where I explain all about it.