Was shocked I bought a 30 plate chiller 23 series "long version" and just tested 5 gallons of Boiling water, Granted it will cool quicker than wort, but was amazed from the results. I use a 100 qt cooler and a submersible pump, with cool tap water and about half a bag of ice it cooled in less than 3 minutes to 68f. Turning the flow down to half caused the temp to drop to 50f and at full flow from a march pump with 1/2 line ID it was right at 70f. This is a amazing plate chiller for $104 from dudadiesel ! Even with some people talking about the cleaning issues i think its worth it for sure.