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I have an Aquanetics 1/6 HP droop-in type chiller that I bought some 10 years ago. Haven't used it in a few years, but back when I did, it performed well. How old is your unit (new?) and what type of thermostat came with it? If you have any specific questions I'd be happy to answer them if I can.
When you deal with something that old, first make sure it still works. Plumb it using a powerhead and large bucket, and make sure the unit can still chill water.
I had a smaller one, that I didn't use for about 4 years, and then when I tried it, the fan would run, but the compressor was shot. Now I got to figure out a way to safely get rid of it.
The company is long out of business, and the unit uses the old freon, so repairs are going to be expensive.
I have a DS-2 by Aqualogic that has been in use for about three years on a 65 gallon. I have NOT run into any problems with the unit. It has been great. I am considering a full 1 hose for the setup we are working on downstairs. The DS-2 also comes with the controller which also has been flawless in performance.