Because a water heater gets used every single day, problems will eventually come up. The good news is that most issues are easy to fix. Here are some common problems that may come up and how to fix them .Think About Replacement Now. If you’re like most people, you’re unlikely to go out lo.ng for a water heater until your existing one fails..Buy NuTone S Heating Element for Heater Water Heater Parts Amazon.com FREE DELIVERY possible on eligible purchases.Water heater leaks can occur for a variety of reasons. It may be something as simple as a slightly open drain valve to a severe issue such as a corroded water tank..