You don't have a hot water heater, why would you need to heat hot water?? <end sarcasm> "Hot water heater" is a pet peeve of mine.
There are other reasons your heater may not be performing as good as it was. Did the change happen gradually or all at once? Has your heater ever been serviced? (Drained/flushed) If it is indeed the element you can likely look up the owner's manual online which will give you a better idea of what you need to do for your brand/model of heater.