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They're basically percolators, aren't they? At least the ones I've used have a metal basket at top for the grounds, and water & heating element in the bottom; the water boils and is forced up a pipe onto the grounds, and percolates down into the main chamber where it's kept warm until it's served. Usually takes 20 minutes to make an urn IIRC.
Thrustvector
tbc
Thanks!
How do you even go about making coffee in one of those things?
Would it have to be instant, or would you just make up dozens of cafetieres or hundreds of Aeropress coffees?