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Thanks for your feedback See aforementioned comment; My experience with internet forums is that there is little or no control over the comments made, the direction the thread takes and they live on forever. You can appreciate why few manufacturers comment.

The tubes are highly elliptical to increase the surface area of coolant touching tube inner wall and outer tube wall touching fin. The fins are louvered between tubes to disrupt air on the fin surface and the tubes are offset to tumble air laterally. The fin hole punching punches and extrudes...

The initial version was built of copper and brass and 11 fins per inch. We had feedback from someone about the heating and offered a 15 fin per inch option and them ultimately made them 20 fin per inch. We are also playing with the heater box to make an 2-5/8" 20 Fin per inch. This depth must...