They have 25 year warranty with performance guarantee of 92%. After 25 years, it will continue to work fine, 8% lower output is perfectly acceptable. Most likel

They have 25 year warranty with performance guarantee of 92%. After 25 years, it will continue to work fine, 8% lower output is perfectly acceptable. Most likely will last 50 years or more. There is no product on the planet that has a a multi decade warranty with this kind of performance guarantee.