There are very few species that can be kept successfully for any stretch of time without a cooler. I can't think of any fish, only prawns and beadlet anemones, as well as common shore crabs.
I have got a 300W model, but in retrospect I would probably go for a more powerful model. My cooler is a bit noisy, I don't know if this is a feature of the model in particular, or just my particular one. It was advertised as being quieter than a domestic refrigerator, but sound more like a washing machine. It does the job though, and takes about an hour to cool the water by one degree.
The back and sides of the tank itself are insulated with aluminised foam, and the tubing to and from the chiller and external filter are covered with plumber's pipe insulation.
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