I originally purchased the Penguin Chiller to support a 180 gallon reef aquarium; a year later when I upgraded that to 400 gallons I used that same chiller. The unit had a small leak because a part failed, after contacting the tech at Penguin I received a replacement part in a timely manner and the units has been supporting the reefs for over 4 years with no additional issues. I would recommend purchasing this unit for the cost, service and dependability. As the unit sits in my office the only negative is the noise when it runs, which is definitely more during the summer months.