HomeRoast Digest


Topic: commercial expresso makers (10 msgs / 174 lines)
1) From: DJ Garcia
I have a Wega Mininova and as much as I loved my Sylvia, I could never
go back. I'm not sure how these compare to the Reneka, but they are
definitely in the small commercial arena, are 110v, and are available at
several Internet sellers:http://www.thedailygrinders.com/store/site/go.cfm?ownerą742DB6-0992-4748-8F9B51A506BDF675
I have the automatic model - I make a hurried double capuccino every
morning before running off to work and it's never failed so far (~6
months). It's reliable, expedient and painless, and I love it. Yes it is
on the bulky side but not as much as many others. CHeck it out.
DJ
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2) From: Dan Bollinger
They are very nice. The best home machine I think.  Second place are the
Isomacs.  Dan

3) From: Mike McGinness
From: "DJ Garcia" 
<Snip>
And the semi-automatic currently priced at only $1095! Can be plumbed, 70
shots per hour production rate, pressure gauge, 2 liter tank, low water
light (for not plumbed safety), 2 liter boiler, auto-boiler refill, 24x7
rated etc. Sounds sweet. Hmmm, time to do some research. Or not!
MM;-) aka Kona Krazy miKe mcKoffee
Variable Variac Rockin' Rosto Roasting
Miss Silvia brewin'
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4) From: The Scarlet Wombat
I've targeted the ECM Giotto for my prosumer unit when I have room and the 
sl90 loses its mind, or I lose mine.  I like the e61 group head for very 
good temperature stability.  How are the Mininova and Isomac for rock solid 
temperature stability.
Dan
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5) From: Dan Bollinger
Any machine with a pressurestat is going to have temperature fluxuations
that require surfing to contend with.  High on my list is adding a PID
controller to my Isomac.  Dan
<Snip>
solid
<Snip>
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6) From: The Scarlet Wombat
That's what I want to avoid, the temperature fluctuations that require 
surfing.  It is hard to do when you can't see the various lights or a 
thermometer.  That's why I've decided on a Giotto, from what I have heard, 
it has excellent temperature stability.  However, I am open minded, 
anything else under $1500 that has good temp characteristics would be of 
interest, too.
Dan
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7) From: Jeffrey A. Bertoia
Dan
Unfortunately all of them require a little temperature surfing.  The 
machines with an E61 group
are very good but...  After sitting the group gets too hot.  My la 
Cimbali does that if I let it sit
(after warming up) for more than about 5 minutes.  But not to worry, 
surfing on a large boiler
E61 machine is fairly simple and can be done completely by sound.
To surf it you can simply run water through the group, for several 
seconds after you here it
stop boiling (hissing).  Also run enough water to ensure that the heater 
turns on, an audible
click and boiler sounds ensue.  When the boiler sounds stop and the 
heater clicks off you are
ready to pour!
Even PID controlled machines have a problem keeping the group at the 
right temperature.
An E61 machine will always drift to too hot since it is actively heated 
by the boiler.  I don't
know about the passive machines but I would bet that if unused they will 
drift to the cool side.
jeff
The Scarlet Wombat wrote:
<Snip>
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8) From: The Scarlet Wombat
Thanks Jeff, I think I could easily handle the surfing technique you 
discuss.  I assume that pulling a number of shots in a row would keep temps 
at about the right point as the e61 head would not have time to sit there 
and overheat.
One would think that, with the abilities we have with thermostats and cpus, 
a machine could be made for under $2000 that could hold its temperature, or 
are the laws of thermodynamics against us on this one?
Dan
Grandchildren accelerate the natural entropy of your home.
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9) From: Ben Treichel
The Scarlet Wombat wrote:
<Snip>
Not the last time I checked. Its probably the same reason that there are 
no decent controls on home roasters.  ;-)
<Snip>
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10) From: Jeffrey A. Bertoia
Dan
You're right!  Commercial and prosuner machines are meant to pull a 
double about
once a minute.  At anything beginning to approach that rate they become 
fairly
stable.  At that rate it becomes the pressurestat that is the main 
impediment.  That
is where a PID based boiler temperature control really shines.
The laws of thermodynamics aren't against you.  But you probably need to 
rethink
the entire machine and not just add a control system.  That is probably 
where the
super-autos will shine since they don't have a lot of the conventional 
limitations.
jeff
The Scarlet Wombat wrote:
<Snip>
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