I looked this morning and my temperature was at 85. I have not changed my heater settings but the raise in temp could be due to the raise in outside air temp I guess. Anyway I looked at my heater in the water closely and the water around it was "distorted", if that makes any since. The water around the heater looked wavy and distorted. Pretty much like you are looking down a hot asphalt road in the summer time and you can see the heat making the air coming off the road distorted. THis is what my water looked like. My heater is a Penn-Plex 12" non-submersible heater.