After working with the largest pool equipment manufacturer in the world I was exposed to thousands of warranty claims for early heater failure. I did not realize that a brand new heater can be broken beyond repair in as little as a single pool season. I also did not realize how many heaters have voided their warranty because they were not installed correctly with bonding protection and check valves to protect from erosion feeders or salt water cells. Since the heater is the most expensive piece of equipment on the pad you definitely want yours to last as long as possible. This helpful guide will teach you what to look for to make sure your heater is installed correctly: Pool Heater Checklist