25 inches from "floor" to "ceiling" is a minimum. The keg is 22"; with a disconnect it's 23.5"; with the bend of the lines you're up about 24.25"; and you need at least a titch of wiggle room for a total of 25" minimum.
My fridge from floor to ceiling is 26" and it's comfortable enough - I'd prefer another inch but 26" works really well.
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