“The circulating water of the water aspirator vacuum pump can be utilized to provide circulating cold water to a condenser or other apparatus. Using the circulating water to cool a condenser will lower the vacuum strength somewhat, as the water pressure will be lowered. When configured solely as a water aspirator vacuum pump, an average vacuum strength of 460 mm Hg (+/- 2% error) was achieved with a maximum vacuum strength of 480 mm Hg (+/- 2% error).”
That’s from the article, so it should be able to pull a hard vacuum but it says less if you also use it to cool the condenser.
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