This testing was designed to highlight the difference in how each machine extracted its coffee grounds. Remember, extraction is tied to water temperature, how long the grounds had to steep, and how evenly that water is distributed in the brew basket. (Depending on how the machine distributes the water and the shape of the basket, any particular ground may or may not receive the same amount of time in contact with water — thus any individual grind may be over-extracted, under-extracted, or just right.) Properly extracted grounds would have a balance of notes and aromas, from slight hints of acid to a pleasant amount of bitterness.
Making the perfect espresso can be a labor of love, but not everyone who wants to drink espresso wants to do all that labor. Pod-based machines make it easier, but then you have fewer type of coffee to choose from. This machine solves both of those problems since it has adapters for most of the popular pods, including Nespresso, Dolce Gusto, K-Fee, or Verismo by Starbucks, and you can also use your own fresh ground coffee.
‡Pre-Infusing: Pre-infusing is a technique where the dry coffee grounds are initially saturated with hot water, allowing a “bloom” of carbon dioxide to escape. This 45-second(ish) process puts hot water into contact with more surface area around each ground throughout the brewing process, as it’s no longer competing with the escaping gas bubbles. It can improve the quality of the final product, since this more uniform contact creates a more even extraction. It’s a feature that six of the 10 pots we tested incorporated into their designs — as well as all four of our top picks.
In terms of maintenance, more complex machines tend to require more cleaning. Accessories like pumps, boiler setups, and thermostats usually forecast the amount of cleanup and maintenance that will be required over time. Buyers should be aware that machines with plastic outer coatings can crack with repeated use, leading to the need for expensive repairs or even replacement.