Most people don't consider the emissivity, conductivity take the heat from the water to the radiator, emissivity takes the heat from the radiator to the air...Copper brass has a higher emissivity than aluminum. Ehernberg missed that in his article. Sounded like a griffin advertisement. Griffins cant be welded either, the tanks are epoxied. Unless they have changed their manufacturing in the last 2 years they are not always the best option. Tim