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I had some overheating problems last weekend (tstat crapped out) and my friend/mechanic explained the cooling system to me. There is apparently a bypass for the rad so the water pump is always circulating coolant within the engine. When the coolant gets too hot, the tstat opens and it starts also coursing through the rad to cool it. You can't run without any water going through or your head would probably warp.
I know that racers use electric water pumps because they push the crap out of their engines, then have to turn them off while blistering hot. They run the water pump for a while with the car off to make sure it cools evenly and doesn't warp anything.
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