1/2HP Penguin Chillers - Water Chiller Ideal for Aquariums (Saltwater or Freshwater), Hydroponics, and Aquaponics applications Environmentally friendly R410a refrigerant compared to ozone depleting R22 refrigerant commonly found in chillers coming from China. Corrosion Resistant Titanium Heat Exchanger Oversized heat exchanger for more efficient heat transfer. Titanium, PVC, Nylon, and Fish-Safe Silicone are the only materials that ever touch water flowing through exchanger. Copper NEVER Comes in Contact with Water (Fish & Coral Safe).