A longer summary: the maximum height of a siphon pumping water, at sea level, predicted by barometric pressure is about 10m.

But the tensile strength of water is nonzero (a surprise to me) and that is enough to allow much higher siphons if you first remove dissolved gases from the water.

The paper speculates that several hundred metres may be possible, perhaps even more. The paper also describes an actual experiment where they showed that a 15 metre high siphon works in practice.