Warranties are a dirty little secret in the chlorinator business. They are never as they are advertised. In the case of PureChlor they advertise a 5 year limited warranty. If you dig into the details of their warranty, you find that it's actually a PRO-RATED warranty. First wo years are covered at 100% replacement. Years 3-5 at a price not exceed 60% of the current MSRP of the product at the time of the warranty claim. The MSRP is rarely disclosed. At least you can find this information buried on their website. Most of the other cell manufacturers fail to tell you this information because it gives then the ability to adjust MSRP at their whim and it ends up with years 3-5 (or whatever the proration periods are) being worthless as your replacement cost will be the same as buying a new unit. So in your case, consider this to be a two year warranty.
You'll also need to provide proof of purchase to process any claims.