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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.
I've often actually enjoyed coffee made in those kind of things, I call it church basement coffee for obvious reasons. No idea what kind of coffee is used though I imagine something that big that sits for any length of time would tend to smooth out any flavour individuality :)
Congratulations!