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Glad you did not use antifreeze.
Many people have misconceptions that antifreeze causes the water to be more heat conductive, or will magically cool itself. Pure water is the best coolant and heat transfer fluid- which is why every other materials specific heat is compared to that of water- which is 1.0.
Antifreeze is used for just that purpose- to lower the freezing temperature of the water (mix). It actually hampers its heat carrying capacity a bit, but that is the tradeoff for being able to not freeze up in cold weather.
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