How Do Drip Filter Coffee Machines Work? If you're unfamiliar with this type of coffee maker, you might be surprised to find it has so many parts. It starts with a reservoir, with an air tube that leads to it and an element of heating inside which heats the water. https://www-coffeee-uk00639.blogoxo.com/30564520/7-things-about-drip-coffee-you-ll-kick-yourself-for-not-knowing