Well, in all honesty, I can't recomend the 2-mdq-sc, because it's very large: ~10 inches long, ~4 1/2" diameter. The main issue is the vents for the motor, which spew out hot air, so I'm having to make a special housing to route this hot air out of the case.
As for your Rio, I think you'll find that the heat comes from the pumping action, so you should get a similar temp. To test it, sit the pump on a chair, and run tubes in and out of a bucket: you'll see what I mean.
The difference in heat that you'll notice, will come from the pump's innefficiency at converting electrical power into a movement of water. That's mainly composed of the motor coils heating up, but like I said, there's not a lot of power transmitted through plastic, so you might not be able to measure a difference.
To clarify a bit: this heat that comes from the pumping action, will appear at the most restrictive points within a cooling loop. In most of our cases, that's the waterblock, followed by the rad. Not the pump.
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