Changes

To smelt any ore, equip it and activate the furnace while there is Coal in inventory. Three units of Coal are required for each smelting operation, regardless of the material or duration. Each possible output stack size is equally likely, ''i.e.'' ores have a 50% chance of yielding 5 bars and a 50% chance of yielding 6 bars.<ref name="extraBars" />

To smelt any ore, equip it and activate the furnace while there is Coal in inventory. Three units of Coal are required for each smelting operation, regardless of the material or duration. Each possible output stack size is equally likely, ''i.e.'' ores have a 50% chance of yielding 5 bars and a 50% chance of yielding 6 bars.<ref name="extraBars" />

When 5 bars are produced, the Heavy Furnace saves 40% [[Coal]] in comparison to normal [[Furnace]]s. When 6 bars are produced, 50% of the [[Coal]] and one sixth of the ore is saved in comparison to normal [[Furnace]]s.

In comparison to normal [[Furnace]]s, on average, 9% of the ore and 45% of the [[Coal]] is saved.

{|class="wikitable sortable"

{|class="wikitable sortable"