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Your water heater needs an expansion tank if you have a “closed” plumbing system. Here s what that means and how to tell if you have one..As water heats and expands, the expansion tank prevents pressure from Where should an expansion tank be installed in relation to the water heater?. min Uploaded by Johnny KincaidThermal expansion tanks promote pressure relief for your water heater. As water heats, it .Shop our selection of Expansion Tank, Water Heater Parts Accessories in the Plumbing Portable Water Heater Thermal Expansion Pressure Tank..