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Message: <blockquote data-quote="cerevisiaephilus" data-source="post: 357383" data-attributes="member: 13421">Definitely confused! But thanks for the response because I think you do a good job of bringing out where I'm getting confused.If the difference the extra horsepower makes is the ability to maintain the same RPM with more mass, i.e. more water, the difference between 40/30 and 60/40 is nothing. Because......they have the same RPM and same pump size, so they only have so much water they can move. They're limited by pump size and RPM, not horsepower. I can see a difference if the pump size were different: at the extreme, for example, make it so big that the 40/30 just couldn't spin the impeller to max RPM, then there would be a difference. But these motors have the same pump size and same RPM, so they're drawing the same amount of water! As for the small difference in the pumps, it's technically 12hp, I suppose. I work in a manufacturing environment where we have lots of liquid pumps. The difference between a 1.5hp pump and a 10hp pump is dramatic. Of course everything is different, impeller size, line size, not just power head.</blockquote>