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PWM is what is used in most dew heater controllers. I'm not sure if these basic units provide "clean" power as I have heard people complain about pwm causing electrical interferience. I know the more expensive commercial dew heater units like Kendrick boast of their filtering to avoid this however I have no experience with this problem.
I have the first of the two RS units I've used as a dew heater controller for a couple of years and it has worked fine in that application.
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