faulty heater?

[Cal_stir]

[quote=christyf5;678818]cranked it up to 86, seems there is a wide temperature deviation from what my tank reads. Light seems to be staying on. The whole thing is hooked up to my controller which switches off at 80, so not a huge deal but still annoying.

sometimes the internal temp of the heater rises to the point where it will shut off before the water is up to temp, but it will cool down and turn back on, this should not be a problem, i find the higher wattage heaters are more prone to this, also, if the heater is not in a high flow area