which would presumably need to be inside or dangling into the big long water collection box?
i see no such thing
Not necessarily. Might be a tube with a floaty thing on it. Alternatively it could be a capacitive switch with metal contacts on the wall of the water chamber - the capacity will change if they're covered by water rather than air.
If none of the above then magnets.
If none of the above then magic.
fixed
@Brommers started
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which would presumably need to be inside or dangling into the big long water collection box?
i see no such thing