Coffee machines, also known as coffeemakers, are appliances used to prepare coffee. They allow the beverage to be brewed without boiling water using a separate device. There are several different types that range in their brewing techniques, as well as size, cost and other characteristics.

The most common of these machines, often called an automatic drip-brew, uses a coffee pot. Grounds are placed in a filter, metal or paper, that fits inside of a funnel. The funnel is set above a ceramic or glass pot. Cold water is then poured into a separate chamber and as it is heated to boiling point, it goes into the funnel.

Historically, making this beverage was an easy process. Roasted and ground beans were placed in a pan or pot, hot water was poured in, and a lid was added to begin the process of infusion. When the drink smelled right, it was ready. Drip brewing, the first modern method for brewing this beverage was invented 125 years ago. Although the design has undergone many changes, the basic concept remains unchanged.

Over time, there has been the development of several brewing devices. For instance, vacuum brewers, percolators, electric drip coffeemakers and pourover, water displacement drip machines. Some of these appliances are no longer produced, while others are still widely used.

The Napier Vacuum machine was invented in the 1800s. It is an example of the early vacuum brewers. In their time, these machines were praised for making clear brew. Despite being too complex for daily use, these products remained popular until the mid twentieth century. The idea was to heat water in the lower portion until expansion pushed the contents through a tube to the upper vessel containing grounds. When the lower vessel had emptied, the heat was removed and the vacuum would draw the brewed beverage through a strainer and back into the lower vessel.

Percolators were developed in the mid nineteenth century. James Nason patented the original percolator design in the United States in 1865, but a farmer Hanson Goodrich is often credited with patenting what is considered the modern design for a percolator. With this design, water is heating in a pot with a removable lid, until the water is pushed through a tube into a brew basket that contains the grains. The liquid that is extracted drains into the basket and drips back into the boiling pot. This cycle is repeated during the brewing process until the liquid that passes through the grounds is steeped sufficiently. A transparent part on the lid of the appliance allows the user to decide if the drink has reached its correct strength and color.

Popularity of percolators was lost with the invention of electric drip coffeemakers in the 1970s. These devices, also called dripolators, heat cold water using a heating chamber. The hot water is then moved through the machine until it reaches the ground coffee that is contained in a brew basket, underneath the spray head that releases the water. The coffee is passed through a filter and drips into a carafe.

Coffee machines are an appliances designed to brew coffee. They come in many designs that use various techniques. The main components necessary to correctly brew this beverage is water and grounds.

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