The Iron Furnace is 20% faster and 25% more fuel efficient than a Furnace. For example, it can smelt 10 items per piece of (Char)Coal compared to only 8 in a regular Furnace and it takes 8 seconds instead of 10 to perform the operation.
Two possible recipes are available. Using a stone furnace reduces the cost by 3 Iron.
Each operation costs 160 units of heat at a speed of 20 units per second, resulting in 8 seconds per smelting operation.
|Fuel Type||Heat Units||Total EU||Number of Operations per Unit of Fuel|
| Stone Furnace
| Iron Furnace
| Electric Furnace
16px (390 EU)
16px (6000-208 EU)
|16px||Fuel can with 6 Coalfuel Cells||30576||76440||152||191||196||10||734|
|16px||Fuel can with 6 Biofuel Cells||10416||26040||52||65||66.77||8.6||250|
|Wood/Planks/Other Wood Items†||300||750||1.5||1.9||1.92||0.25||7.2|
|16px||Regular Saplings and Sticks||100||250||0.5||0.6||0.64||< 0.1||2.4|
|16px||Rubber Sapling||80||200||0.4||0.5||0.51||< 0.1||1.92|
†Other Wood Items = Any block with its material set to "Wood" (includes blocks added by other mods if material defined properly). Includes all other items that can be burned in a regular Furnace, see
Smelting for a complete list.
‡Assuming the smelting of 2 items simultaneously, divide by 2 if you are only smelting one item. For values < 2 keep in mind that you will actually have 2 partially finished units.
††Lava buckets are worth 10% of their value (2000) inside Iron Furnaces and Generators.