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There are carbonated hot springs all around the world. Why do you feel the geysers need to be cold water?

692c. He is effervescent; he is effervescent; Shu, let thy arms be about N.

507c. effervescent, proceeding from leg and tail of the Great (One) who is in splendour.

868b. thy water, thy cool water-libation is the inundation of the Great One (who) which is come forth from thee.

22a. This is thy cool water, Osiris; this is thy cool water, O N., which went forth from thy son, which went forth from Horus.

I don't believe there's such a thing as a warm water geyser. It's not an impossibility since the same processes that heat water in the earth are the same as those which carbonate it but warm water loses its carbonation very readily and at a much greater depth than cold water. The well for a warm water geyser would have to be extremely deep making a natural one improbable and an Egyptian made one impossible.