First off, a ambient style water cooled system does not use alot of electricity unless you use an overpowered pump (which will also ad heat to the system). The eheim I am using in my current system uses like 28watts. That is low. Think of your house lights.
Secondly, height does not correspond to head in a closed system. What will cause head are restrictions: tubing, waterblocks, fittings, and heat exchanger. All will cause restrictions which will result in higher head.
Whether or not watercooling is for you, you will have to decide. Do alot of research before you buy anything. Read as many posts as you can here, and you should be able to decide for yourself. A well designed system will lower noise, will lower temps, and increase overclockability/stability.
Brian
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Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core | Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose).
Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently.
Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)
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