Regular maintenance helps protect your water heater from breakdowns and prevents the buildup of mineral deposits that can shorten the device’s lifespan or interfere with the production of hot water. If you use a hot water heater with a tank, you should flush out and refill the tank every four months to remove sediments. Remember to turn off the unit’s power and water before flushing the tank. You should also opt for professional maintenance and service for your water heater at least once a year. Opt for maintenance twice a year if you live in an area with very hard water.