The frequency of water heater replacement depends on several factors, including the quality of the unit, maintenance, and usage. On average, a traditional storage-tank water heater may need to be replaced every 10 to 15 years. However, yearly maintenance can help extend the lifespan of your water heater. It’s best to consult with a professional plumber like R&R Plumbing to issues with your water heater and provide expert replacement of warn parts.