Zoo Med Laboratories’ Turtletherm preset thermostat-controlled heater keeps up to 30 gal. of water at 78 F (26 C). The fully submersible product features a digital temperature display and suction-cup mounting. The heater keeps aquatic turtles healthy and helps prevent loss of appetite to cold-water temperatures, the company reports. It is great for red-eared sliders, African sidenecks, musk turtles, mud turtles, painted turtles, map turtles, diamondback terrapins and other types of aquatic turtles. Available in 50-watt and 100-watt models.