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Eheim say you get the best performance by submerging thier submergable pumps.
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Thats nonsense. It will be a little cooler, but otherwise the same.
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You must also ensure the pump is run wet as the water lubricates the bearings, and submerging mostly guarantees this.
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What bearings?
Just wondering, have you ever looked at a magdrive pump? They are totally sealed. From the pumps perspective, submerged will be the same as inline. Its not like they have gapeing holes that let coolant leak out the sides if not submerged.
The only advantage of submerged is easy purging, though with a res inline is really easy too. Meanwhile the heat issue is BS. Even inline 80% of the heat is going into the coolant.
Do whats easiest.