check out probrewer.com. why does it need to be chilled to 1-5 degrees? Since its jacketed go with the glycol chiller. I'm sure you could find a small one that can handle the 600l tank..
Toasting Tortoise Brewery
Primary - Slightly Smoked APA V.2, Milk Chocolate Oatmeal Coffee Stout
Secondary - American BarleyWine.
Kegged- Indian Brittish Ale,
Dry Irish stout.
Bottled - Rum Oaked Porter , Hibiscus Mead, Belgian Pale.