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It's not 3 for the water pump, it's more like 6 (without underdrive pulley, with thermostat restriction). With the underdrive pulley, under most driving conditions, the engine rpm will be low enough that the power consumption won't be too crazy. If there were a market for it, a coolant bypass valve to alleviate high rpm pressure would help with that peak loss.
The alternator isn't always pulling that much power either, remember the alternator has a fan built into it, and spinning the fan at 15000rpm uses a lot of power!
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