All-Glass Aquarium Submersible Aquarium Heater

All-Glass Aquarium introduces the latest in aquarium heater technology!
These new UL listed heaters feature state-of-the-art technology, employing a patented heating film and special shatter-resistant glass to provide extra durability and even heating.
Heaters can also be submersed in either vertical or horizontal positions, making it easy to conceal them in aquariums. Heaters will also automatically shut off when they are not properly submersed.

Available in four sizes!
50, 100, 200 and 300 watt to fit home aquariums up to 90 gallons