Hmm, not sure how else to explain...
You will need a secondary heat source (CHE) if the ambient/cool side temp in your tank cannot be maintained within the proper range - which is 77º-80º. If the air temps in the room stay in that range then you will not need a secondary heat source. But most people do not keep their homes heated year round at 77º-80º, thus the secondary heat source.
Again, a UTH will not raise ambient air temps. It only provides a hot spot for belly heat. Your Herpstat1 will control the UTH just fine. But if you are using two heat sources (UTH and CHE) - then you would need a Herpstat2.
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