I think the Aquamist pump has a temperature cut that would occur before water would boil also with the water passing through it the pump should be kept cool under most intended uses. The only exception is if the pump is located in a hot spot and the heat sink absorbs instaead of dissipates heat.
With the filter as the highest point in one of my systems it can get air initially trapped in it but this should clear once primed. I also had a leak at that filter connection that was pulling air in. The pump reacted badly enough that it was noticable and corrected quickly.
A sealed system with any pump appropriate for water injection should keep air out of the system and not cause any problems.
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