Here is a response I got from Mumac:
"Model Nordica - Faema, Milan, 1960
2 coffee reserve groups - 1 delivery group - Preserved model
Machine featuring two boilers, one of which dedicated to the two reserve groups specifically designed for hotel needs, each containing a litre of coffee ready to be delivered directly into the cup; and the other one dedicated to the central group for the preparation of the traditional espresso coffee. The name is a homage to Nordic countries, which are great filter coffee consumers."
Looks like the "reserve groups" are some kind of drip filter arrangement, when I read the description I was initially thinking one of those horrible (and scary) "hotel groups"
Originally Posted by kop
What are those "hotel groups"
machines then ?
If this one aint one of them ?
A hotel group extracts under pressure, think a PF which is more like 150mm(? never seen one in the flesh, there are pictures around somewhere on here I think) diameter and 8 spouts instead of 58mm with 2...
Originally Posted by patu
That much suface area under 9-bar of pressure is extremely scary because the stresses are significantly higher, though it's been suggested that they probably don't operate at a full 9-bar due to this problem, they're not particularly common beasts.
58mm = 26.42cm^2 = ~242kg of force (total)
150mm = 176.7cm^2 = ~1621kg of force (total)
Check out this thread http://coffeesnobs.com.au/brewing-eq...tml#post399219