Those elements are easy to replace, place heater so element is on top, and unscrew it, and replace with a new one, not forgetting to replace the o ring seal at the base of the threads. You might lose a drop or two of the oil fill, but nothing to worry about. The elements tend to have a very generic size and thread, despite the brand of the unit, as most are made to the same pattern, with only the brand applied being different, along with a slightly different style of side plastic case.