How big is your UTH you have now? If you have a tiny UTH on a 40 breeder, it's not going to do much good.
But if you are able to maintain those temps and are able to keep humidity up with the lamp, I don't see a reason to change it.
Oh, and no, you don't need a timer. Not unless you're switching the lamp on or off. If you're thinking lamp dimmers that you see people mention, those are to regulate heat. You said you have a rheostat, which is essentially the same thing.
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