[Leica] Starbucks

[joecodi at clearsightusa.com (Joseph Codispoti)]

>>>
In that case it's not authentic espresso. Machines which rely on steam
pressure
to move water through the coffee actually only generate a fraction of the
pressure required to produce espresso. Yes they can make nice coffee but
no it isn't espresso.
>>>


In the better espresso machines the water for the coffee is drawn from the
"heat exchanger", which is contained within the boiler.
The water in the boiler is heated by a heating element while the exchanger,
which holds enough water for one shot or two, is heated by the hot water and
steam that surrounds it; hence the difference in temperature between steam
and water drawn for coffee.
As the water is depleted during extraction, it is automatically replaced
with cold water from either a reservoir or a direct line to the source.

Joe