Would you really want the added weight and current pull of a water cooling system? Resovoir, pump,radiator,fan and lines? Plus the risk of leakage all over your electronics, not to mention having to keep up with making sure you have clean water, no corrosion or orgranisms. You probably could use a cpu water block for the esc to replace the fan and heatsink. But if your pump were to fail, you probably wouldn't know until it was too late.