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The furnace is a special block currently only available in the indev and infdev versions of Minecraft. Before the furnace appeared, smelting was accomplished by creating a fire and dropping the ores into it. Now the furnace has its own smelting menu where several smelting operations can be done. It consists of one field for the object that will be smelted, one field for the output object and one field for a fuel. The fuel variates to either log, plank, stick, coal and also the items that you shouldn't use like chests and the workbench. Each operation takes 10 seconds.

The different fuels have different burning times:
Fuel Burning Time Number of Operations per Fuel Amount to Light a Furnace All Night
Coal
80 seconds
8
6.75
Log
15 seconds
1.5
36
Plank
15 seconds
1.5
36
Workbench
15 seconds
1.5
36
Chest
15 seconds
1.5
36
Stick
5 seconds
0.5
108


The smelting menu
The furnace will take time to smelt objects, but it will also work when the smelting menu is closed, as long as there are still objects to smelt and there's enough fuel. If all objects are smelted, the furnace will stop using fuel. When the fuel runs out, the heat in the furnace, indicated by the flame icon, will slowly decrease and when it is gone, the furnace will become inactive. If a smelting process was running, it will be aborted and has to be started again from the beginning

Furnaces take more time to destroy than other blocks, making them a very valuable building material. However, since they require 8 blocks to craft, they are difficult to amass in any large quantities.

A glitch is known wherein a player destroys a furnace block in use (I.E. smelting iron). the furnace will be able to be picked up, and when placed down, will still be alight for an indefinite period of time. If you right click on it, however, it will have nothing in it, making it serve a dual purpose of destroying items and providing light without fuel.

The following smelting operations are known:

Smelting Operations
Input -----> Output
File:Ironoreitm.png Iron Ore Flame Iron File:Ironitm.png
File:Goldoreitm.png Gold Ore Flame Gold File:Golditm.png
File:Sanditm.png Sand Flame Glass File:Glassitm.png
File:Cobblestoneitm.png Cobblestone Flame Stone File:Stoneitm.png
File:Porkitm.png Pork Flame Grilled Pork File:Grilledporkitm.png



Crafting Furnace
Name Materials Output Description
Furnace File:Craftingfurnace.png File:Craftingfurnace2.png Used for smelting.


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