Damn,that difference is realy huge, and in that case it's not that much better then Eheim 1250 for us 220V folks.
How much was it ? Anyway my two pums in series are about the same Head as your Iwaki and if I turn one of I also don't notice any significant change in temps (maybe 1°C), and I'm using internal diode for temp measurement, together with my new micro channel water block prototype. I'm getting 33°C folding load temps with axp 1977MHz 2,15V , 21°C water
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