A. Not necessarily. Most electric water heaters can be serviced, depending on age and condition of the water heater. Most water heater manufacturers recommend a full service once a year. This includes draining down the water heater, checking expansion tank, replacing elements and thermostats. We also attempt to clear as much solid buildup of calcium or lime from your water heater. Regular service will save you a bundle and help prolong the life of your water heater. We suggest every couple of years.