Fanless eh?
Well since you are looking at water you might consider passive evaporation as a means of cooling.
- Use a very large resivour with a great deal of surface area for the water. My res has 400cm^2 of surface area. It stablilizes at about 42°C in a 21°C room. I don't like it that hot so a 3V fan cools it down to about 31°C.
There are disadvantages of course -
1. You basically have to use tap water, too expensive to do it any other way. This means that you will be breaking down the system for a cleaning every-so-often depending on your water quality. My own system runs for about three months between cleanings.
2. Large open body of water for crap to fall in. Some cheese cloth can help here.
3. Large area needed.
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