Not easy to breed.
In 1903, Desiderio Pavoni obtained the Bezzera design patent and began manufacturing this coffee machine in 1905. After that, Teresio Arduino also began to produce similar coffee machines, and other manufacturers followed suit. In the 1920s, traces of such coffee machines could be seen everywhere in Italian coffee shops.
But the Italians are obviously not satisfied with the results of steam pressure coffee machines. It should be possible to increase the pressure through steam, but increasing the heat may cause the coffee powder to be burned during the brewing process, losing the aromatic oils hidden in the coffee powder, and extracting more bitter coffee. Therefore, some people have thought about whether it is possible to directly pressurize hot water instead of boiling the water and using steam as the pressure.
Between the two wars, people used the natural pressure of water flowing from taps to increase the pressure of brewing coffee. The coffee machine uses electricity to quickly heat a small pot of water to the brewing temperature. Each pot of water brews a portion of coffee, and each small pot is connected to the faucet. The operator only needs to press the lever on the small pot, and the pressure from the faucet will push the hot water in the small pot to the coffee grounds.
Based on the differences in water pressure in various regions, generally speaking, the pressure produced by this coffee machine is greater than the 1.5 atmospheres produced by a steam pressure coffee machine. The height of this coffee machine is not too different from the steam pressure coffee machine, but it is smaller overall. The appearance is more in line with the popular trend of the late 1920s and 1930s, which replaced the arcs of steam pressure coffee machines with straight lines and geometric lines.