The defective products are 50-, 100-, 150-, 200- and 250-watt Top Fin brand plastic aquarium heaters with model numbers: HT50, HT100, HT150, HT200 or HT250. The heaters are black, rod-shaped, and about 13 inches tall. “Top Fin Premium Aquarium Heater,” the model number and the heater’s wattage are printed on the side of the heater near the top. The lot number is printed beneath the words “Made in China.” All lot numbers are included in this recall.Consumers should immediately stop using the recalled heaters and return them to any PetSmart store for a full refund.