Power is indicated by watts, identify your soldering iron using this factor. Some imported soldering irons have different voltages 220v is the standard. Make sure to clean the base of the iron after replacing the element, small metal and crumbs might damage the elements overtime.
Best quality heating soldering iron element in sri lanka are made using ni-chrome heating alloy with steel spool. Soldering element replacement is easy, most irons can be unscrewed or unlocked from the handle. Next unwind the protective tape around irons inner core. Make sure to keep the safety tape for re assembly after installing the new soldering iron heating element. Next disconnect the two connectors by twisting ends. Next remove the metal lugs next to the connectors. Next unscrew the element using a spanner.
Now pull the heating element from the soldering iron with your needle-nose pliers. Insert your new heating element, connect the wires and apply the old safety tape.