Vacuum coffee maker

[2] While vacuum coffee makers generally were excessively complex for everyday use, they were prized for producing a clear brew, and were quite popular until the middle of the twentieth century.

Vacuum coffee makers remain popular in some parts of Asia, including Japan and Taiwan.

[3] The Bauhaus interpretation of this device can be seen in Gerhard Marcks' Sintrax [de] coffee maker of 1925.

[citation needed] Once the vapor has forced the hot water out, the counterweight activates a spring-loaded snuffer which smothers the flame and allows the initial chamber to cool down thus lowering pressure (creating a vacuum) and causing the brewed coffee to seep in.

In 2022, Japanese Tiger Corporation was working on an automated coffee-maker based on the vacuum coffee maker principle, the Siphonysta.

A vacuum coffee maker. Industrial design-classic by Abram Games.
Vacuum pot coffee brewer: vapor pressure forces the water into the upper chamber.
As temperature increases, the vapor pressure of water increases, increasing the pressure in the bottom vessel and pushing water up the siphon. At the normal boiling point of 100 °C, the vapor pressure equals the standard atmospheric pressure of 760 Torr (760 mm of mercury).