Turtletherm - 50 W Preset the thermostat in your turtles enclosure with the Zoo Med 50 W Turtletherm. It will heat up to 15 gallons of water up to 78 degrees Fahrenheit or 26 degrees Celsius. The easy to read, digital thermometer display features suction cup mounting with the ability to be entirely submerged underwater. This thermostat is perfect for Red Ear Sliders, African Sidenecks, Musk, Mud, Painted, Map, Diamondback Terrapin and other types of aquatic turtles. Keeping your pet at the right temperature is vital for their health, and even assists in the prevention of appetite loss!