I would skip the baffles all together and tap in to the top and bottom of the barrels sides and install a car radiator with the fan blowing over that, plastic is not a good conductor of heat and the surface area of a single automotive radiator is going to be about the same as the whole outside of a barrel, the taps top and bottom are going to allow a good thermo syphin so you are getting the greatest heat differential as well.
Last edited by Ryland; 05-26-12 at 08:29 AM..
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