[spoonman]

I have found the best way to adjust heaters is if the tank is at the right temp to start with just put the heater in and turn up the dial until the light comes on and then turn down just until the light goes off. The should be set at the temp of the water. If the present temp of the water is too cool, then put the heater in and turn the dial down until the light goes off, then turn up just until the light goes on, leave for a few hours, then if it isnt warn enough, turn up until the light comes on again and leave a few more hours. Keep doing this until you get to the desired temperature. That way the temp comes up slowly and you dont have to trust the numbers on the heater. I havent found many that were accurate in the past. For me I keep my house at 80 degrees summer and winter so I dont use heaters...lol.