Drip Coffee Makers
A drip Coffee Maker works by dripping, hence the name 
, hot (between 195F (90C) and 205F (97C)) Water from the reservoir through a filter that holds the grounded coffee and then the finished brew into a glass or thermos carafe. It takes approximately 4-8 minutes to make 6-12 cups of coffee.
1972 was the year when the first automatic drip and brew coffee maker was introduced to the home use market by the coffee maker producer Mr.Coffee. Nowadays drip coffee makers are the most bought home coffee makers and vastly popular for making small to large (up to 12 cups) quantities of coffee at home.
Coffee Urns
A coffee urn works with the percolator system and has a brewing speed of one cup per minute. It is the workhorse under the large, 12+ cup coffee makers. It is ideal for heavy duty and larger catering needs.
The bottom part of the percolator is filled with water and a basket, containing the grounded coffee, is placed aloft in the pot, sustained by a hollow tube. The water is heated, until it nearly boils. The water climbs, as it heats up, through the tube, and then rains over the grounded coffee in the basket, helped by gravity. The coffee leaves the basket with the coffee through little holes, rejoining the main water reservoir and starting its journey again. If this circle is repeated too often, the resulting coffee can become too strong and bitter. Done right, it produces a rich coffee with a lot of flavor, and best of all, fills the room with delicious coffee aroma!
Coffee Percolator
A coffee maker percolator style works similar to a coffee urn. It produces around 12 cups of coffee, or more, in a minimum time. Compared with a urn, it often brews the coffee directly into a carafe style container. The lower part of the percolator is filled with water and a basket, filled with coffee is placed above, connected via a hollow tube. When the water starts to boil, it starts to climb through the tube and to drip over the coffee in the basket. The coffee re-joins the water in the lower reservoir and starts the circle again.