What is the technical difference between UL listed Fire Pumps & Non UL listed Fire Pumps?
Is there any performance difference or any other working principal difference?
UL certification requires testing and compliance with UL standards. There could be all kinds of differences between a UL listed pump and one that isn't listed.
Some examples of differences could be it could be a completely different type than allowed (i.e. end suction pumps are not permitted by UL for larger flow rates). It may have a different type of impeller that gives a rising pressure curve (which is not allowed for UL listed pumps). It may not be able to pass the same tests (e.g. hydrostatic tests).
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