Sun, 03 May 2026 10:09:42 +0000

That Clunk When Heating? Uncover the Hidden Pain of Missing Water Heater Expansion Tanks! Heating up your home shouldn’t feel like a workout—yet one sudden clunk during your furnace or water heater startup might turn your cozy routine into a heated cause for concern. Have you ever heard that jarring clunk when your heating kicks on? Often overlooked, this unexpected noise could be signaling a critical issue: a missing or bad expansion tank. ### What Is a Water Heater Expansion Tank, and Why Does It Matter? Water heater expansion tanks are small but mighty components designed to protect your plumbing system from excessive pressure buildup. When water heats inside the tank, it expands—creating pressure that could damage pipes, valves, and your water heater itself over time. The expansion tank acts as a safety valve by absorbing this pressure by storing the excess water and maintaining system stability.