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I've always wondered the same thing. It seems to me that if you're pumping heat into your corrector plate you're driving the optical components away from equalising with the ambient temperature.
Perhaps that is something else that we could test - try and image under the same conditions but with the dew heater on and with it off. I don't have enough experience at imaging yet to have formed an opinion on the effect of the dew heater - in fact, so far, when I have done imaging of the moon or planets I have been lucky and it has not been dewy. I would be interested to know what the more experienced SCT owners think of the effect of a dew heater on seeing or imaging fine planetary detail.
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