As legend has it, Ethiopian goats were the first to discover the delightful properties of coffee beans when they ate the raw beans right off the stem. The goats nibbled happily away at the beans, probably right around 2 o'clock every afternoon, until finally an astute goat herder noticed the goats' perky behavior, gave the beans a taste, found them quite stimulating, and rushed them off to the nearest monastery.
A refinement of the piston machine is the pump-driven machine, which was introduced in the Faema E61 in 1961, and has become the most popular design in commercial espresso bars. Instead of using manual force, a motor-driven pump provides the force necessary for espresso brewing. Espresso machines are made to accept water directly from a cold water line supply, common in commercial installations, or from a separate tank that must be filled with water by hand. The latter is more common with lower-volume commercial installations and domestic espresso machines. Due to the required high pumping pressure and precision flow control needed, the particular type of electric pumps typically used are known as solenoid-piston pumps. These pumps are classified as a positive displacement type (general category) of pump.
“I like the Technivorm Moccamaster because, from a scientific standpoint, it creates the proper water temperature (and temperature consistency) for good extraction of flavor from the beans. That’s the problem with most cheap automatics — they’re inconsistent about temperature. It also has a shower-head design for good water dispersion and saturation of the grounds. It consistently tastes almost (almost, I stress) as good as a manual drip.” — Andrew Chou, engineer, General Motors
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While we love the all-inclusive features of the Breville, there’s one thing it can’t do on its own, at least not without a hefty repair bill. If you love dark roasts, any machine that features an internal grinder is off-limits. The oily shine characteristic of dark roasts builds up in any grinder — but while you can disassemble and clean standalone grinders, this is rarely an option for internal ones. The residual oil left in an internal grinder will, at best, give future shots a rancid flavor. At worst, the oil will clog the grinder. If you want to brew dark roasts on the Breville, plan on buying a separate grinder.
"I have used this machine for about a week, and it is awesome! I had used an espresso machine frequently years ago, but got sick of the grinding, prepping, priming, etc., especially before work in the morning. So, I eventually gave up and bought a plain-ole coffee maker. Unfortunately, "regular" coffee, to me, tastes like hot water. I even tried a Kuerig, but returned it within a month - it was more convenient, but the coffees are no higher quality than any grocery-store brand coffee. So I debated for a long time about whether I should wait for one of these brand-new Nespresso Vertuoline machines, or just buy one of the older, espresso-only Nespresso machines.