I bought an ebo jager 200w heater off ebay and it is the older model, the one without a temperature dial. The dial is numbered 1-10 with 5 being circled (I guess meaning optimum temperature in Ebo's eyes). I was wondering if anyone has any experience with these models, and if you do what number coincides with approx. 82 degrees? I know that the number suggested would be for the model you had, I am simply looking for a startin point (adjusting requires a screw driver), so that I will not have to take it in and out of the tank.