Shut down water and drain down electric water heater in ceiling between bathrooms. Project will take multiple people to carefully remove water heater from ceiling. Cut out water lines to remove and install new water heater. Furnish and installed new 2.5 gallon thermal expansion tank. Make all necessary connections, and run temperature and pressure discharge line to hub drain. Slowly, pressurize system, and fill up water heater. Wire in new water heater and turn on once full.