Superheat Item is a non-combat spell that allows you to smelt ores without a furnace. Each cast creates one bar, and it cannot be used on noted ores. Creating a bar using Superheat Item requires the same amount of ores as if you were using a furnace, along with the same Smithing level. Regular Smithing experience is awarded along with the Magic experience gained for casting the spell.

When creating Iron bars via Superheat Item, the success rate is 100%, as opposed to only a 50% chance when using a furnace.

A Magic level of 43 is required to use this spell, giving 52 experience. It requires 1 Nature rune and 4 Fire runes to cast.