Rick Matthews writes:

Statements were made earlier that water only boils when
heat is added and that water only evaporates when heat
is added. Neither statement is true.

It is true in the sense that the heat content of the water itself can
only evaporate a small portion of it. If you squirted warm water out of
the Space Shuttle in orbit, some would flash to vapor but most of it would
just wind up floating around frozen. The point is simply that vacuum
itself does not evaporate water, it is heat, contrary to the popular
notion.