Some of these ideas may be getting close to do-able. I'm thinking use the chiller to cool water in a sump. Second pump in the sump sends cool water through Y-connections to several Q tanks with heat exchangers, then back to sump. No water mixing. Main problem - what is the heat exchanger? Most are some non-corrosive metal like titanium. Not practical for me. Plastic is poorly conductive. Any ideas out there?