All the machines we tested came with either insulated carafes or glass pots with built-in warmers. Both have pros and cons. Glass pots are typically easier to clean because they tend to have wider mouths, and the lack of internal insulation means that glass pots will have a greater interior volume relative to its exterior volume — basically, it’s easier to get your hand or dish sponge into a glass pot. On the other hand, glass pots are more fragile and have to be heated from a base plate. In our tests, those base plates could even raise the temperature of the coffee, like with the CuisinArt, which can make coffee taste burnt.
Pierce's design was later improved by U.S. appliance engineers Ivar Jepson, Ludvik Koci, and Eric Bylund of Sunbeam in the late 1930s. They altered the heating chamber and eliminated the recessed well which was hard to clean. They also made several improvements to the filtering mechanism. Their improved design of plated metals, styled by industrial designer Alfonso Iannelli, became the famous Sunbeam Coffeemaster line of automated vacuum coffee makers (Models C-20, C-30, C40, and C-50). The Coffeemaster vacuum brewer was sold in large numbers in the United States during the years immediately following World War I.
There’s also no way to adjust the temperature of the water on the Bonavita, or tinker with any of the other variables some of our other top picks gave access to. And that’s the other downside to this excellent machine: What you get is what you get, and if you do want to experiment with the flavor of your coffee, it will depend entirely on the beans you buy and the size you grind them to. Good thing the coffee it brews right out of the box is so dang good.
“Strength, blend, decaf, cream, or sugar, there are many options when it comes to a cup of coffee. It seems every person has his or her own unique preferences to get them that perfect cup of joe. However, one factor that was often out of the home-coffee fan’s control was temperature. You either drank it at the temperature it came out of the coffee maker or you let it cool somewhat before sipping began. Cuisinart has aimed to turn that limitation on its head. This Cuisinart DCC-3650 adds a temperature control. It actually brews the coffee at one of three different user-defined temperatures. Impressive.”
The Barista Express espresso machine uses a 15 Bar Italian Pump and a 1600W Thermocoil heating system to make rich espresso. Since it's a semi-automatic machine, the Breville automatically adjusts water temperature after steam to extract the most flavor out of your beans. The machine also has a 67 fl.oz (2L) water tank with a nice handle for easy removal, and it comes with a replaceable water filter.
Our brew-performance tests measure the brew temperature and contact time (how long water stays within a sweet spot of 195° to 205° F for brewing). We measure concentration using a refractometer, a device that measures the amount of coffee dissolved in each brew. Our convenience tests look at how easy it is to set timers, fill the reservoir, clean the machine, and more. And for the first time, we’re incorporating predicted reliability and owner satisfaction ratings into the new Overall Score for each model. We determine these ratings for each drip coffee maker brand using survey data collected from thousands of CR members.