Product review (5 stars): Included instructions make it easy to install
Included instructions make it easy to install.  Ensure that the old gasket is removed and the water heater threads are cleaned before installing the new heater with the included gasket.  Flush out the water heater before beginning installation to remove the scale built up in the bottom of the water heater.  If you are replacing the lower heater, then the entire tank must be drained.  Opening the pressure relief valve will allow air entering the tank to empty tank faster.