Originally Posted by allgrain
i found this link that shows the thermal conductivity of various materials and copper has about 10X the thermal conductivity over stainless. does that mean it will take 10' of stainless for every 1' of copper to cool the same amount of wort?
No, because the walls of the stainless tubing are substantially thinner than copper tubing of the same diameter. My stainless chiller is light as a feather. And while I haven't done any precise tests, I don't notice it being any slower than my comparably sized copper chiller.
I bought it because I prefer stainless, not because it was cheaper. (Actually, it wasn't cheaper at the time!)