Heat cable works great actually. It does not develop hot and cold spots like heat tape tends to do. I use both, and both work fine.
I prefer heat cable because, while its more expensive, it is coated in a fire retardant materiel. Meaning it will smolder instead of catch on fire. You use it just like heat tape and yes you plug it right into the thermostat of your choice. You can buy it at most reptile specialty stores, but I usually get it on amazon.
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