To be honest, you are looking at it with a pretty closed mind zoson.
I have built one myself, in more of a tower configuration so that it can go on the corner of my desk. It only takes up about 30cm x 25 cm on my desk. It holds about 35L of water, but being in a tower it needs filling more regularly as otherwise the performance is degraded with an increase in head. So I fill mine every two weeks or so, with normal tap water. It can run compelely passive for days and days on end, the water simple never heats up.
IMHO there is absolutely no point in runing distilled water in a closed loop or open look system. In about 1 minute, the water wil pick up ions from the copper, becoming ionized again, hence there is little benefit.
Could you please post a pic of your internal setup? I havent seen a radiator that has been able to maintain ambients that is kept internal. You must have done a very good job with the ducting
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