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Lifespan of pool water heaters depends on various variables such as the model, brand, types, usage, location of installation and such. For example, if you isntall a swimming pool heater in an area where it would be used all the time, it woul definitely have a smaller lifespan if not maintained properly. That also states the fact that maintenance of pool water heater is one of the most important factor to decide the lifespand. Hence, Hard to say. There have been heat pumps going on 20 years. Most seem to last about 12 years. Gas heaters last about 6 or 7. There are big differences due to locations, parts of the country, beach, sprinklers etc. It is a common fact that the quality of heaters being made today will make them last longer. The best heaters that have been ever made, are being manufactured today.