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Originally Posted by satanicoo
That means that, probably at 24 volts, this pump will overun a johnson pump right?
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Easily.
However, it is most likely not healthy to run it at 24V due to the heat the motor would put out. Generally that's how continuously rated long-life DC motors are made. They are way over-specced internally, and then run at a lower voltage so basically they are "idling" and not really stressed in relation to what they can handle. While the pump could handle 24V, it may not last for more than a year while doing so, if even that long.
My lab-bench PSU supplies up to 15V, and I figure that would probably a safe peak voltage to run the pump at full-time. At 15V, and assuming that it is indeed as good as specified (and being German made - that's a fairly safe assumption), it would still substantially out-perform the Johnson CM30P7-1, and still draw less power.