The answer to 'how long will water heater last' is that the average lifespan of a water heater is 8-12 years, depending on the type of water heater and how well it is maintained. Tank-style water heaters tend to last 8-10 years, while tankless water heaters can last 10-15 years with proper care. Regular maintenance, such as flushing the tank and inspecting the anode rod, can help extend the life of a water heater.
Several factors can impact the longevity of a water heater, including the quality of the unit, the water hardness in your area, and how often the heater is used. Homes with larger families or heavy hot water usage may see their water heaters wear out more quickly. If you notice any signs of trouble, such as leaks, strange noises, or a drop in hot water output, it's best to have a professional HVAC technician inspect the unit.