Here's an interesting article...http://www.howstuffworks.com/coffee-maker.htmLooking at this analysis, it seems that the
simple heating forces the water up into the
filter basket (forgive me, but I've forgotten
what that's called--is it convection?).  If this
is true--and if all drip brewers operate on the
same principle--then there should be very little
difference between brewers in terms of water
temperature.  Can some engineer confirm, deny or
other wise comment on this?
And on another note, I have now cycled through
all the Yemeni coffees and I don't think any of
them compare to the Raimi in terms of complexity
in the cup.  Raimi truly rocks!
Cheers,
Paul
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Great link!
For the fatal flaw in most cheap coffee makers, see the first picture on the
third page:http://www.howstuffworks.com/coffee-maker2.htmNote that the water tube that delivers the heated water is fed through the
cold water reservoir.  I wouldn't be surprised if it ended up as cold as 150
degrees!  Slightly better makers run the tube alongside the reservoir.  The
only way to do it right is to have a short tube away from the cold water.
I think the best concept for a drip maker was the Capresso "Aroma Classic"
that boiled the full load above the drip filter, and then dropped it in!
Unfortunately, it had a few other flaws, like limited capacity, and no
thermos, and it wouldn't fit under cabinets!
-jeff

Read the last paragraph on the coffee-maker3 page. Part of the water boils,
the check valve stops backwards flow, and the *steam* pressure forces the
column of water into the filter basket. Cold water enters the heater to
replace what has been blown out of the riser tube, and stops the action
until again, some of the water boils. This action is repeated until there is
no more water. The water entering the filter basket is composed of portions
of near-boiling water, hot water in the riser tube from the previous cycle,
and water from the reservoir that has not yet been heated. The relative
amounts of these portions vary across the entire spectrum of drip brewer
designs. They also vary with elapsed time in a single brewer.
The analogy (on page 4) with an aquarium air-operated filter is incorrect.
An aquarium filter flows continuously due to the density difference between
a column of water mixed with air bubbles and the water in the tank.
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