Quote Originally Posted by Tony View Post
It has a heavy base, I took mine to -5C or so on the TEC chiller and it did real well. The top material specs are -10C maybe a little better, so don't go to cold.

Im using 2 here with convection cooling and they do real well with that also, so heat transfer is good.
Are you using a single pass radiator? (hose connection on opposite end tanks)