It's not that bad... I remember looking at this design, when I realized that the res needs to be turned upside down, so that the coolant completely immerses the heat sink. Knowing the heat source, you'd have to use more than one of these.
Also, there is a problem with ice forming on the fins, and once that happens, efficiency goes down, the coolant temp will rise until the ice melts, and back again... The solution is to keep the water moving quickly through those fins, but that reduces the efficiency too... Another type of coolant would be required, and that's kind of funny because it's strictly so that the water doesn't freeze on the fins, it's not to prevent it from totally freezing altogether.
So the options are:
1- use multiple 80 Watt pelts, and air cool them
or
2-use one big pelt, and water cool it too (2nd loop).
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