What Size Socket to Remove Water Heater Element From?

In order to determine the correct sized socket to remove water heater element from, you first need to find the power cord of the appliance. The power cord of your heater usually gives you a figure of its length and when you attach the end of the power cord to a wall socket or an electric socket, it will give you the length of the socket as well. Now, when you take a measurement using the tape measure, write down the measurement that you have taken in terms of its length and then take the following measurement: what size socket to remove water heater element is this? In other words, how long should the end of the cord that holds the hot water heater element be when you are done measuring?