I saw absolutely no noticable performance difference between an Eheim 1048 (~160gph) and an Eheim 1250 (~320gph) for the White Water. I think there is a difference, in the order of 0.2C, after accounting for the extra pump heat that the 1250 dumps into the water, but 0.2C is something that's hard to pick up even with a CPU die sensor as it's quite within the realms of error.
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