I'd tell you that you had to use stainless if I was trying to shift an overpriced stainless wort chiller.
If I can't use copper, then I've been doing it wrong for the last 12 years.
My buddies dad has been chilling beer with copper for 25 years.
We will have to add this one to the "this vs this" list
copper vs SS
extract vs all grain...
This thread has me wondering about using copper lines to feed from a corny in a kegorator to the beer tower...I've read some complain the beer still warms on its way to the top of the tower and I am getting ready to convert a Sanyo 4912.
Of course one would have to use the correct fittings to make it work and I'm not sure about the CO2 psi vs. the ID of the copper tubing...hmmmm?