Top Fin Aquarium heaters, according to the Consumer Product Safety Commission, are on now on recall due to possible fire or electrical hazard to consumers. The heaters were sold at Petsmart from August 2014 to April 2015. The models include 50, 100, 150, 200 and 250 watt aquarium heaters. The company has 13 reports of incidents so far, including fire, four reports of electrical shock and multiple reports of electrical shortage. Petsmart is giving consumers a full refund for any returned units purchased at the store.