How Do Drip Filter Coffee Machines Work? You might be surprised by the sheer number of components included in this coffee maker, especially if you're unfamiliar with it. It starts with a reservoir, with an air tube that leads to it and an internal heating element that heats the water. https://wwwcoffeeeuk62513.alltdesign.com/10-misconceptions-your-boss-holds-regarding-drip-coffee-50120846