Deduct 4 in. Again, at this new point any sane plumber would have insisted on replacing the whole water heater. Unheated water enters one side of the tank. Installing a new water heater in time can prevent this from happening. Relight the pilot light and turn the tank on. Allow the water to flow through the spigots for about a minute to bleed air that's trapped inside the lines, and turn off the taps.
Safety First I hope this information has been helpful and the pictures useful in helping understand the parts and terminology being used.
How to Install a Water Heater Yourself Quick and Simple (With Pictures)