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Most new comers spend most of their budget on an espresso machine and then buy the cheapest grinder they can find.
When it comes to producing high quality espresso, the grinder is far more important than the espresso machine. It is the grinder that shaves the beans across the cell walls and exposes the coffee in the cells for extraction. Get a very high quality grinder that can keep its shaft alignment for the longest time. When the shafts are no longer in perfect alignment, the burrs are no longer parallel, placing limits on how fine a grind can be achieved.
Also look for a grinder with continuous adjsutments permitting small variations in grind settings.
All espresso machines do three things: they heat water; deliver a pre-measured amount of water when a particular button is pressed; and, pressurize the water for delivery to the portafilter. All of them can make mediocre espresso in the hands of a poorly trained barista. A highly capable barista can coax exceptional espresso using any of these machines.
Machines vary in quality depending on how well they do these functions regardless of how many shots are made in a given time.
There are lots of issues to consider when selecting an espresso machine to provide high quality espresso. Of all the issues such as, pre-infusion, ease of programming, ergonomics, access to service,......, the most critical is temperature stability in a shop environment where production rates vary widely from time to time.
This is where the multiple boiler machines have a definite edge over the single boiler machines.
Good Luck.
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