About The Hexhead
Tank type water heaters usually have heads shaped in form of hexagons. This hexagon style head is often easy to locate. But for times when this is not the case, get ready to do the following : Drill not-too-deep holes about 1/4 inches through the metal sheet at top of the water heater. Do not drill these holes directly into the water heater as this would only destroy your water heater.
Once the drilling is done, use a screwdriver preferably or a pen where you have no other option, then try to locate the hex head simply by poking into the drilled hole. Just