What is the purpose of a water heater overflow tank and how does it prevent potential water damage in case of a malfunction?

The purpose of a water heater overflow tank is to collect excess water that may leak from the water heater due to pressure buildup or a malfunction. This tank helps prevent potential water damage by providing a designated space for the excess water to go, rather than allowing it to leak onto the floor or other surfaces. This helps protect the surrounding area from water damage and potential flooding.