The answer to 'water heater high energy bills' is that there are several common causes, including a malfunctioning thermostat, sediment buildup, or an old, inefficient water heater. Symptoms can include the water not getting hot enough, the heater running constantly, or unusually high energy bills. Solutions may involve adjusting the thermostat, flushing the tank to remove sediment, or replacing the water heater if it's at the end of its lifespan.
Many water heater issues can be addressed with basic DIY troubleshooting and maintenance, but it's best to call a professional HVAC technician if you're uncomfortable working with the equipment or if the problem persists. A technician can properly diagnose the issue and recommend the most cost-effective solution.