Hermit crabs require temperatures between 68 and 74 degrees Fahrenheit at all times. To keep the optimum temperature, try the Hermit Crab Heater from ZooMed, specially designed for hermit crabs. The mini-sized heater is made with plastic crab habitats in mind.
Designed to be mounted behind plastic tanks. The 4-watt nichrome heating element is perfect for a terrarium of 5 gallons or less. . UL listed for safety. . 120V, 60Hz operation only. Manufacturer offers a full one-year warranty. Heater measures approximately 7 inches long x 4 inches wide.