Marineland Visi-Therm Stealth Submersible Aquarium Heaters

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. Lifetime manufacturer's warranty. UL-Listed and one of the safest heaters available. Made in USA. Advanced, streamlined design is hardly noticeable inside the aquarium. Easy-set temperature select dial. Ensures accuracy to within 1° Fahrenheit. Shatterproof thermal plastic casing. Protects components against UVs and thermal/mechanical shock. Shuts off automatically when out of water; restarts automatically when in water.