I dont think the heat source absolutely has to be located under the enclosure. In the wild, the sun bakes the Earth which in turn creates belly and ambient heat. In the same way, a ceramic heat emmiter will heat up the ground and also the ambient air and can be left on 24 hours a day as long as it is controlled by a thermostat. A lot of people on here seem to have multiple heat sources but unless the enclosure is very large, ie 8 feet plus, it's not needed. Just as long as the heat source creates a basking spot, maintains an ambient temperature and has a wattage appropriate to the size of the enclosure.
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