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Originally Posted by JJR512
So more is better...OK.
What, then, is "maximum" head--does that mean that's the most resistance that can be present with the pump still working at all; in other words, more resistance and the pump just stops? For example, the Swiftech MCP650 has a "Maximum head" rating of 10 feet. Now this pump also has a "Maximum discharge" rating of 317gph, is it assumed that this is with 0 head if the flow rating doesn't otherwise mention @ how much head?
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Yeah, the pump will be unable to push water after the max head pressure is reached. Yes, generally if no head is specified then the number given is at 0 head. That number is useless though. You really need at least one other number to show the true power of the pump. One 317GPH pump might max out at 5ft of head while another may max out at 13ft of head. More GPH does not equal higher head max (very common misconception).