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Stealth submersible aquarium heaters combine advanced streamlined design with precise water-calibrated accuracy and UL-listed safety features. They deliver the ultimate in easy-set adjustability, shatterproof durability and safe, efficient operation. And start-up is as easy as 1-2-3: just set it, install it, and plug it in.Easy-set temperature select dial.Ensures accuracy to within 1 degree Fahrenheit.Shatterproof thermal plastic casing.Protects components against UVs and thermal/mechanical shock.Has stop/restart overheat protection.Heater shuts down automatically if left out of water.50-Watt: for aquariums up to 15 gallons (measures 8.25 inches in length) 100-Watt: for aquariums up to 30 gallons (measures 10 inches in length) 200-Watt: for aquariums up to 55 gallons (measures 13.75 inches in length) 250-Watt: for aquariums up to 75 gallons (measures 15 inches in length)