Coffee maker Cona

This coffee maker works based on a vacuum principle that was conceived in Germany in 1827. The two heat-resistant glass tanks are connected together. The lower tank contains water that is heated. The produced vapour condenses in the second tank, which contains the loose filter coffee. When the heating is stopped, the air contracts and draws a vacuum. The negative pressure draws the brewed coffee back to the lower tank, which contains a filter. The coffee can then be served.