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Old 05-17-2015, 03:11 PM   #61
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Originally Posted by ranger42c View Post
But if the pump is here, the thru-hull is there, and the distance is X feet... the pump still has to move the water X feet, yes?

Yes - but with a hose that's twice the diameter it only has to move the water at a quarter of the speed - so the same power pump will work as for the narrower hose where the water has to move faster. The only thing that matters is the hydrostatic pressure at the pump (ignoring friction). That's determined by how far below the waterline it is.

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