I'm basing my values on a (possibly flawed) ratio of the water rise above ambient with the pump turned off (0.0C funnily enough eh?), the pump turned on but the computer off, and finally with the computer on an running at what I believe to be about a real 100W CPU heat load (Barton AthlonXP @ 2.6GHz/1.95v running BurnK7).
Not saying that's the most accurate thing. Like I said, just a guesstimate. Mind you, the Iwaki specs say that the motor is actually rated at 45W of power at the 70W power draw, and as myv65 will tell you, pretty much all of a motor's energy will make it into the water in one way or another, whether that be motor heat or friction.
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