A portafilter (or group handle) attaches to the grouphead of semi-automatic and piston-driven espresso machines, and carries a tamped puck of coffee grounds within its basket. It is usually made of brass for better heat retention, and is attached by a plastic or wooden handle. The portafilter forms a seal with the espresso machine's gasket, and directs high-pressure hot water through the coffee puck. After-market retailers also sell bottomless portafilters that minimize the espresso's contact with any metal. A bottomless portafilter is one tool baristas use to analyze the quality of the coffee grind and the evenness of the extraction and allows for a visual check of "channeling" or the condition in which water is able to pierce a hole in the espresso puck during the brew process leading to poor extraction. Often, baristas use knockboxes to store their spent espresso grounds after they have pulled a shot.
An electric drip coffee maker can also be referred to as a dripolator. It normally works by admitting water from a cold water reservoir into a flexible hose in the base of the reservoir leading directly to a thin metal tube or heating chamber (usually, of aluminum), where a heating element surrounding the metal tube heats the water. The heated water moves through the machine using the thermosiphon principle. Thermally-induced pressure and the siphoning effect move the heated water through an insulated rubber or vinyl riser hose, into a spray head, and onto the ground coffee, which is contained in a brew basket mounted below the spray head. The coffee passes through a filter and drips down into the carafe. A one-way valve in the tubing prevents water from siphoning back into the reservoir. A thermostat attached to the heating element turns off the heating element as needed to prevent overheating the water in the metal tube (overheating would produce only steam in the supply hose), then turns back on when the water cools below a certain threshold. For a standard 10-12 cup drip coffeemaker, using a more powerful thermostatically-controlled heating element (in terms of wattage produced), can heat increased amounts of water more quickly using larger heating chambers, generally producing higher average water temperatures at the spray head over the entire brewing cycle. This process can be further improved by changing the aluminum construction of most heating chambers to a metal with superior heat transfer qualities, such as copper.
Supply your foodservice establishment with a commercial coffee maker, so you can offer your customers hot beverages and caffeine boosts any time of the day. Not only is coffee quick and easy to make, but it can also lead to increased profits. Plus, coffee is customizable, which means you’ll be able to accommodate almost anyone’s drink request. Read more
The term dual boiler is used narrowly for machines with two separate boilers, and more broadly for what are more properly called dual heater (DH) machines, featuring a boiler for brewing and a separate thermoblock (TB) for heating brew water to steaming temperature – opposite to HX machines, where the boiler is at steaming temperature and is cooled to brewing temperature.
The gist: The Nespresso Pixie is an Amazon's Choice product and boasts a 4.5-star rating. It pumps espresso with 19 bars of pressure and has a 25-second heat-up time. It has two one-touch buttons (in case you want a single espresso or a slightly larger "Lungo" serving), a 0.7 liter water tank and an empty water tank alert that let's you know when you're running low on H2O. The machine also comes with a welcome kit that includes a range of capsules featuring various flavors.
The Gaggia Classic is a stylish old-school Italian espresso maker. It can pull a really delicious, creamy shot of espresso, but the machine does not have a PID—therefore its results aren't very consistent. While the machine is pretty, it doesn't have the well-thought design features of the Breville, like a sensor drip tray and a space for the tamper, nor does it come with a milk pitcher. Its plastic tamper is flimsy and won't effectively press down the espresso grounds. The Gaggia's steamer wand also doesn't consistently incorporate foam, and instead produces large bubbles on top.
Manual or semi-automatic machines offer more control of shot quality. Because when to cut the shot (brew time) is a critical variable, which is often adjusted shot-by-shot, semi-automatic machines are often preferred over automatics, though some machines are automatic. Manual machines are more popular in Europe, where it is more common to drink straight espresso.
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.