Ack I did come off as a dick there. Sorry, no offense intended.
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I can't find the comment on performance so maybe that is not accurate. The impellor spindle on the Eheims runs in a ceramic bearing that is lubricated by the water being pumped, that is why they have to be primed before use - so the bearing surface gets some lubricant.
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When you said bearings, I though "ball bearings". Anyway I see what you are saying, so yes the coolant does lubricate it, but it doesn't matter if its submerged or not.
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You quote 80%, would you care to present your test setup and measurments taken to validate this? Or is it bs?
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BS of course.
I'm not sure how I could simulate the resistance of a cooling setup, minimize heat loss and measure acturately enough to derive a good figure for watts. However my 1250 runs fairly cool to the touch (much much cooler then a hard disk nearby with more air flow and much less power radiated). Therefore I reasoned that 4/5 of the heat was entering the coolant.
Regardless with heatercores easily handleing several hundred watts, the difference between 10 or 20w is irrelevent.
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Eheim's do not use the same drive system as a Danner so you can not compare them as far as bearings or lack thereof.
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I've never opened a Danner, I was refering to the generic class of pumps with an impellor floating on a magnetic field. Is this the wrong name ?:shrug: