It's a fairly simple idea. But I was wondering if anyone has ever tried it. Have those of you that use any kind of external WC system (Zalman Reserator, Koolance Exos, Custom, etc.) ever tried leaving the radiator outside on a cold winter night? I know it would take a decent amount of tubing, but I was just curious of the temperature improvement. I could see it having a very large amount of improvement.