Anarchy Reptile Ceramic Heat Emitter creates a hot area in the reptile's enclosure. It increases the overall ambient air temperature and simulates the heat provided by the sun. Heat Emitters should always be placed at one end of your reptile's enclosure to create a thermal gradient, allowing them to choose their ideal temperature. It is recommended that all heat sources be used in conjunction with a thermostat to prevent your reptile from overheating.