Your cookie preferences
We use cookies to remember your preferences and understand how shoppers use our site, helping us improve your shopping experience.
Read our privacy policyProtect your water system and extend appliance life with the Everbilt Expansion Tank. Built with a heavy-duty butyl diaphragm system to absorb the expansion of water volume and help prevent dangerous pressure build-up. This Everbilt Expansion Tank will absorb pressure increases when properly installed on your closed water system. By preventing pressure from exceeding 80 psi, it safeguards your pipes, water heater, and appliances from potential damage – saving you money on repairs and replacements in the long run.
Most local building codes now require an expansion tank for new water heater installations. When water heats up, it expands. In older plumbing systems, this extra water could flow backward into the city water supply. Modern homes often use backflow prevention valves, which prevent reverse flow and create a closed plumbing system.
In a closed system, expanding hot water has nowhere to go, causing water pressure to rise. An expansion tank provides a safe place for this expanded water, helping protect the water heater, plumbing system, fixtures, and appliances from excessive pressure.
Important: Always check local plumbing codes and installation requirements to determine whether an expansion tank is required for your system.