Continuing on from the end of this thread. First: I'm not planning on using this in my pc. I have played with peltiers many moons ago and discovered very early on that power demands & requirements + condensation make the whole thing too much hassle. As like rowan194, I'm planning to replace the generic aircooling in my peltier fridge, with a water cooling system. However my experience with water cooling is nil. Block = cpu/gpu/nb? Reservoir required? Rad size? For these questions I'm not sure where to start, as I obviously neither want supreme-overkill, nor something equal/inferior to aircooling. Peltier runs at 55W when on 240v source and 45W on 12v source.. not exactly sure why it gets lowered on the 12v source. Perhaps minimising drain on car battery (as 12v source is cigarette adapter). I'm assuming the internal ac-dc converter won't be enough to power a pump? The fan it runs with now is a rather stock 12v .23A noisy 120mm bastard if that helps (there's no other visible info I could find to indicate it's power output).