Expensive, uses a lot of energy but is essential for a large aquarium. The plastic case protects my stingrays from burns. Update: 2015-09-02: still works fine. 2 other heaters have failed in my aquarium in the last two years (significantly increased calorific values). But this one is still running. I bought a second one for another tank and this is my first time having an accurate and safe heater in this tank. Update: 08/18/2016: still works! This is the best aquarium heater I have ever had. Don't worry about others. You will be disappointed. Update: 11/08/2017: 2 heaters still work great! Worth the price. **Do not buy other heaters.**
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