Cooling systems frequently use water to dissipate heat because it possesses a much higher "specific heat" index. In fact, water has a higher index than any other common substance. This high specific heat means water requires much more energy to change its temperature than other substances, which in turn makes it the optimal medium to regulate temperature. Distilled water offers no regulatory advantage, but its purity minimizes the build-up of residues within a system.
Hi again Harry - You are the owner of a water specialty company? The varietals are limitless. There is mineral, sparkling, purified,spring, distilled, etc...
Someday it will be holy water, to a certain denomination:)
Best of everything-Bill