The answer to 'how often to replace water heater' is that most water heaters need to be replaced every 8 to 12 years, on average. The lifespan of a water heater depends on factors like the type of heater, the quality of the unit, and how well it's maintained. With proper care and regular maintenance, some water heaters can last up to 15 years, but it's generally recommended to replace the unit before it reaches the 12-year mark.
Regular maintenance, such as flushing the tank and checking the anode rod, can help extend the life of a water heater. However, eventually the tank will corrode, the heating elements will fail, or other issues will arise that make replacement the best option. Paying attention to signs of aging, like increased energy bills, strange noises, or reduced hot water output, can help homeowners determine when it's time to replace their water heater.