What are the steps involved in water heater expansion tank installation?

The steps involved in water heater expansion tank installation are as follows:

1. Turn off the water supply to the water heater.
2. Drain the water heater to relieve pressure.
3. Determine the appropriate location for the expansion tank.
4. Install a tee fitting on the cold water supply line.
5. Connect the expansion tank to the tee fitting.
6. Secure the expansion tank in place.
7. Turn the water supply back on and check for leaks.
8. Adjust the air pressure in the expansion tank if necessary.
9. Test the water heater to ensure proper functioning.