Most pumps seem to come with dire warnings about not running them dry.

Anyone know why this is? Does a pump rely on water to cool it - albeit using
'coolant' at 80-odd degrees? Or is water needed to lubricate the bearing in
some way?

It would sometimes be useful to test a pump dry - by running it for a minute
or so -before fitting it, and I'm trying to assess the consequences of so
doing.
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Cheers,
Set Square
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