I'm not sure what your point is, so you might consider this splitting hairs. Heat is not being generated, it's being converted. That conversion requires a sour

I'm not sure what your point is, so you might consider this splitting hairs. Heat is not being generated, it's being converted. That conversion requires a source that will run out. It will continue to be warm for any meaningful timeline to a human, but it is not infinite and will end in heat death.