Automatic coffee makers are a brilliant time-saver, preparing your favorite latte or lungo at the press of a button, and handling all the grinding, brewing, and steaming while you get on with making your breakfast, styling your hair, or just chilling on the sofa for a couple of minutes. Unfortunately, you can easily lose that time later on when the machine needs cleaning.
Handling the whole coffee-making process inside a plastic box seems like a great idea (out of sight, out of mind), but the heat, moisture, and organic matter (i.e., coffee grounds) make the dark, steamy interior of your espresso machine an ideal breeding ground for bacteria and mold.
Got a strong stomach? Here's what an unloved, unwashed brew unit will eventually look like, courtesy of the aptly-named subreddit r/MoldlyInteresting. "Heirloom culture fermented brew," observed one Redditor. "Aged in the dark. Price per cup: $35.00 USD."
It doesn't have to be that way, though. Emptying the drip tray and grounds bin daily and cleaning the machine according to the instructions in the manual are the first and most obvious steps.
However, manufacturers are now starting to add features that will help even further. Ninja just launched a coffee maker with a built-in fan, as you'd find in a PC case, which provides ventilation, and the KitchenAid KF4 has an excellent maintenance option that evaporates all water from the system in a satisfying cloud of steam.
It's a feature I wish all coffee makers had, and it's fantastic if you're planning to put your automatic espresso machine in storage, are moving house, or just want to be sure it's not full of stagnating water for two weeks while you're away on vacation.
After choosing the 'evaporate' option from the KF4's menu, you'll be prompted to remove the water tank (which you can wash and leave to air dry), then attach the hose for the milk system to the side of the coffee dispenser, push the other end into a hole in the drip tray, and place a large container under the dispenser spout. Then, stand back and watch as a surprising amount of water boils away, leaving everything perfectly dry and inhospitable to microorganisms.
I'm currently testing the KF4, and will publish a full review very soon. Stay tuned to see whether it can earn a place in our roundup of the best espresso machines.
