Furnace

Furnace
Type:	Block
Physics:	None
Found naturally:	No
Identifier:	furnace

A furnace (also known as a smelter) is a block used to heat and convert items into another form, usually being ores or meat. A furnace (similar to a crafting table) is considered one of the fundamental blocks required to advance in survival mode.

Obtaining

8 pieces of cobblestone are required to craft a furnace. The crafting design should be a square with the center blank.

Usage

The furnace can be walked through and does not count as a barrier for the player and other entities. However, it does not get destroyed by water and can be pushed by a piston like a normal block. redstone, signs, and any torch can be placed on it like a regular block.

Shift-click (or right click) to open the furnace menu.

• Top left: items to be smelted. (input)
• Bottom left: items to be burnt as fuel.
• Right: items produced. (output)
• Left indicator: Remaining heat, as a proportion of total heat given by last fuel item consumed.
• Middle indicator: Per-item smelting progress.

Process

Smelting begins only when both left slots contain items, or input items are added while there is residual heat available.

1. One fuel item is removed and converted to heat. Note: Heat is depleted at a constant rate, regardless of use.
2. Smelt indicator progresses. Note: All smelts have the same heat cost.
   1. IF heat runs out before a smelt completes, then more fuel is burnt (1) if available, otherwise the smelt fails. Note: adding fuel afterwards resets progress rather than adding to it.
3. Upon smelt completion, IF there is output space, one input item is removed, and one output item added. Note: If there is no output space, the input item remains, and fuel is continuously consumed.
   1. IF input items remain, continue from (2).
4. Once no input items remain, no further fuel is consumed. Any remaining heat will steadily deplete regardless with some waste likely before additional input items can be added to use it.

Fuels

• Wood (3 smelts)
• Wooden Planks (1 smelt)
• Stick/Bamboo (½ smelt)
• Wooden tools (3 smelts)
• Coal/Charcoal (8 smelts)
• Coal Block (72 smelts)
• Bucket of Lava (128 smelts)

Recipes

Task

Number	Icon[ng]	Name	Newgrounds name	Description [ng]	Objective	Points[ng]	Requirements
8		Make a furnace	Furnace	Furnaces will burn and smelt items	Make a furnace	5	×1 ×8

History

Version	Date	Changes
1.19.4_2	Dec 23, 2011	Fixed infinite smeltable items glitch
1.20	Feb 04, 2012	Wood into charcoal recipe added to Furnace page
1.22	Jun 29, 2012	Updated texture of smelter/oven (and renamed to furnace)
1.23	Oct 31, 2012	Chests, ovens, etc. work in the Nether Updated help menu Removed Furnace page
1.25	May 11, 2013	Smelting netherrack makes nether brick Furnaces emit light when smelting
1.26.5	Jul 03, 2014	TNT can be placed in a furnace Furnaces now continue to smelt when fuel is removed Lava buckets return an empty bucket in the furnace
1.27	Nov 13, 2015	Saplings can be a fuel in the furnace Add and split stacks in the furnace slots
1.28	Oct 08, 2016	Updated furnace code to support durability and item data
1.29	Sep 17, 2019	New item: Furnace minecart Furnace, iron bars, and some stairs and slabs properly require a pickaxe to mine
1.30	Nov 13, 2020	Furnaces and brewing stands no longer duplicate when moved with sticky pistons Iron and gold tools and armor smelt into an iron nugget or gold nugget
1.31	Dec 30, 2023	Fixed furnaces and other slots not allowing right-click to split stacks Fixed furnace visually turning off between smelts

Bugs

• Taking something out of the Furnace that was smelting then placing something else in instantly smelts the item that was placed in Furnace.

Trivia

• The furnace used to be known as the smelter oven.

Gallery

• 

  A furnace while smelting something.

See also

• Smelting
• Crafting table