Single-serve coffee makers work by pumping highly pressurized water through a needle into a pod filled with coffee grounds. The water then drips out of the pod through a small hole. Once it exits the pod, the coffee drips into a mug below the pod.
Single serve coffee makers usually have a reservoir of water. When this tank is empty, users need to replace it manually. The water is transferred from the reservoir to the coffee maker by a pump located at the bottom of the water tank.
Single serve coffee makers extract coffee in under a minute. This is a much shorter extraction time compared to other methods of coffee making, such as drip or French press extraction. This quick brewing time is possible because of the high pressure and heat of the water used in pod coffee makers. An air compressor provides the force needed to pressurize the water to 1 or 2 bars.
The heating element found in single serve coffee makers is highly efficient. It can heat the water for coffee up to 185 degrees Fahrenheit in under 60 seconds. Many single serve coffee makers have adjustable heat settings, so the consumer may choose the desired temperature of coffee.