The answer to 'how often to replace water heater' is that most water heaters should be replaced every 8-12 years, depending on the type and usage. Traditional tank-style water heaters typically last 8-12 years, while tankless or on-demand water heaters can last 15-20 years with proper maintenance. The lifespan of your water heater can vary based on factors like water quality, usage, and maintenance.
It's important to have your water heater inspected annually and to replace it before it fails to avoid potential water damage. Signs it may be time to replace your water heater include rusty water, strange noises, or reduced hot water capacity. When it's time for a replacement, it's best to hire a licensed HVAC professional to ensure the new water heater is properly installed and sized for your home's needs.