Bunn coffee makers for home use are available through Bed, Bath & Beyond, Walmart and Amazon. These coffee makers offer a pour-through technology that brews an entire pot of coffee in just over three minutes.
The secret to Bunn's short brewing time is the hot water reservoir. The coffee pot keeps the reserve hot water in a heated stainless steel reservoir continuously. A thermostat regulates the temperature to 200 degrees Fahrenheit, the ideal temperature for brewing coffee. When the user adds more water to the top of the machine, it starts a siphon action to pull hot water from the bottom of the tank as the cold water refills it from the top.
The volume of the tank is large enough that the tank recovers to the set temperature quickly. While the machine works well for the family that brews coffee every day, the hot water evaporates from the reservoir if the machine is left unused several days in a row.
The machine also uses a engineered spray head to ensure it delivers the water to the basket in a manner that extracts the maximum flavor from the grounds. The filter drains into a 50-ounce glass carafe that sits on a porcelain covered warming element to keep coffee hot for serving.