What are Vacuum Coffee Makers and How Does It Work?

Basically, it consists of two glass units, which are placed on top of one another.

The upper glass unit is the coffee grounds chamber and the lower glass unit is the decanter. When placed on top of one another, the attachment is perfectly sealed, usually with a rubber stopper, and a tube containing a filter runs from the bottom of the upper glass chamber into the lower glass chamber.

Vacuum coffee makers make use of coffee ground to a coarser texture. The coffee grounds are placed inside the upper chamber. The lower chamber is filled with water.


ove coffee? Here is some more "free stuff"! Learn more with this ebook (is free!)

Interesting coffee resources

V60 Coffee Brewing method 

Coffee Sock Brewing method 

Learn about these at the free coffee classes (online)


Once both of the glass chambers are attached, the whole apparatus is placed over a heating element, such as a stove.

As the lower chamber starts to heat up and the water approaches its boiling point, pressure accumulates within the lower chamber and pushes the water up into the tube and into the upper chamber.

Once the heated water reaches the upper chamber, it mixes with the coffee grounds and coffee extraction begins. While the vacuum coffee maker sits on the heating element, the water will not flow back into the lower chamber because of the pressure.

Once the water has been introduced to the coffee grounds for quite some time (usually three to four minutes), the vacuum coffee brewer can be removed from the heating element and allowed to sit on a cool surface.

This cooling process creates a vacuum within the lower chamber, and the contents of the upper chamber are filtered down through the tube into the lower chamber.

As a result, the lower chamber, or decanter, will be filled with coffee, while all the coffee grounds will be left inside the upper chamber.

To serve, simply separate the upper chamber from the lower chamber. The lower chamber will serve as the decanter.

The whole process sounds more complicated than it actually is. While it is easier and more convenient to use an automatic drip coffee maker, using a vacuum brewer isn’t that hard at all.

In fact, once you get the whole process down, you can brew great tasting cups of coffee, even better than those brewed from an automatic drip coffee maker.

If you happen to become interested in using a vacuum coffee brewer, look for Cory vacuum coffee makers in online stores, such as EBay and Amazon.

It may be difficult and even impossible to find one in a local store in your area, so looking for one online would be your best bet.

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About US | OCM Profile

OCM (OnCoffeeMakers.com) was started in 2007 with the first webpage about coffee machines. And for a number of years, we focused on helping people find their desired coffee machine (we still are helping folks with that! So, if you are looking for coffee machines for office or restaurants - check out the link). 

In 2010, we started getting enquiries on restaurant marketing and we start to help food and beverage brands with their marketing. Below are campaigns and events that we have done over the years: 

OCM's campaigns: F&B Marketing Ideas by OCM 

OCM's Events: F&B Industry events by or with OCM

Check out this restaurant marketing guide to learn more about the many campaigns and companies we have worked with. 

Since then, we have also created many marketing workshops and classes for the F&B industry. Many of these modules are still running in tertiary institutions such as Temasek Polytechnic Skillsfuture Academy and also ITE College East COC classes, below are some snippets of our lectures and workshops: 

OCM’s F&B workshops: Food and Beverage Marketing Lectures | Workshops - click to watch classes on customer journey map, JTBD and more. 

So, if you are looking for industry practitioners to help you scale your coffee or F&B businesses, do drop us a message or book an appointment. Do also check out our various social media platforms on regular F&B and coffee market updates: 

For regular coffee (F&B) related videos: OCM Youtube

For Daily Coffee Inspiration (fun coffee content): OCM IG

For insights into the coffee (F&B) industry: OCM LinkedIN 

PS: For the coffee lovers, we continue to share coffee articles (and videos) and have also started a free coffee class section (with free online coffee training supported by coffee partners).

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