Many homes in Concord require a water expansion tank due to modern plumbing codes and system designs. If your home has a pressure regulator, check valve, or backflow preventer, the plumbing system is considered closed. In these setups, an expansion tank is often required to safely manage pressure changes. Homeowners may notice warning signs such as fluctuating water pressure, dripping temperature and pressure relief valves, or frequent plumbing leaks. These symptoms often point to unmanaged thermal expansion.
Water expansion tanks typically last several years, but their lifespan depends on water quality, system pressure, and proper installation. Over time, the internal bladder can fail, allowing the tank to fill completely with water and lose its ability to absorb pressure. When this happens, the tank no longer provides protection. Replacement is recommended when pressure issues return, the tank becomes waterlogged, or the system shows signs of stress. Replacing a failing tank early helps avoid damage to water heaters and plumbing lines.
Incorrectly installed expansion tanks can cause more problems than they solve. Common issues include improper sizing, incorrect air charge settings, and poor mounting support. An undersized tank cannot handle the volume of expansion, while an oversized tank may not function efficiently. If the air pressure inside the tank is not properly matched to the system pressure, the tank will fail prematurely. Unsupported tanks can strain piping and fittings, increasing the risk of leaks.
A properly installed water expansion tank stabilizes pressure, extends the life of your water heater, and reduces stress on the entire plumbing system. During installation, system pressure must be measured and the tank adjusted accordingly. Periodic inspections ensure the tank is still functioning as intended. Addressing expansion tank needs proactively helps maintain consistent performance and protects your home from avoidable plumbing damage.
