Cobalt Aquatics Mini-Therm heaters are compact, fully submersible heaters designed specifically for small aquariums. These 10-watt heaters maintain a constant ON design for consistent temperature. The heater's housing is constructed from a shatter-resistant thermal plastic polymer, ensuring durability and longevity. Here are some key features of the Cobalt Aquatics Mini-Therm heater: * **Compact and Submersible:** Designed for small aquariums, these heaters are fully submersible for versatile placement. * **Shatter-Resistant Housing:** Made from a thermal plastic polymer, the housing is built to withstand impacts and prevent breakage. * **Constant ON Design:** The heater operates with a consistent ON design, providing steady and reliable heat to maintain the desired temperature. * **Ceramic Heat Radiator:** Internally, a ceramic heat radiator efficiently distributes heat throughout the aquarium. The Cobalt Aquatics Mini-Therm provides peace of mind with its durable construction and reliable performance for your small aquatic environment.