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Originally Posted by jaydee116
Head is basically the resistance of the flow in the loop.
EDIT: In other words the more restrictive the loop is the higher head rated pump you want. 300GPH at 0 head means there is no restriction in the loop. 300GPH at 3 feet of head means there is enough restriction in the loop to equal putting 3 feet of vertical pipe/tubing on the outlet of the pump and then measuring the flow at the end of the 3 feet of tubing/pipe.
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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?