It’s possible that you’ve never heard the phrase sacrificial anode rod. You might not even know where in your home you would find one—but it’s there. Any guesses? The anode rod is a component of your tank water heater, and while the water heater itself may last for 15 years or more, the anode rod won’t. It’s a part that needs to be replaced regularly, which is why it is referred to as sacrificial. If all this comes as a surprise to you, read on. We’d love to shed some light on this mysterious topic.