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For example, to lock a furnace at (0,64,0) so that the furnace cannot be opened unless the player is holding an item named "Furnace Key", use / data merge block 0 64 0. If a furnace's Lock tag is not blank, the furnace cannot be opened unless the player is holding an item with the same name as the Lock tag's text. In Java Edition, a furnace can be "locked" by setting its Lock tag using the / data command. If the fuel slot is empty and the burning fuel is consumed before an item completes smelting, the smelting stops, the smelted item is unchanged, and smelting must be restarted with new fuel.īy default, the GUI of a furnace is labeled "Furnace", but this name can be customized by naming it in an anvil before placing it, or by changing the CustomName tag using the / data command‌. After it burns out, no additional fuel is decremented from the fuel slot if the upper slot is empty.

For example, a piece of coal burns for 80 seconds and can smelt eight items, but if only one item is smelted (or if the item is pulled out before smelting is complete), the coal still continues burning for the full 80 seconds, wasting seven items worth of smelting. The fuel continues burning until it is consumed, regardless of whether the upper slot has any items remaining to smelt.

As soon as smelting begins, the fuel slot is decremented immediately and that unit of fuel begins burning. The number of items that a fuel source can smelt depends on the type of fuel. A furnace smelts items at a speed of one item every 200 game ticks (10 seconds) or six items per minute. A fuel source (up to one stack of fuel items) is placed in the lower slot, and the items (up to one stack) to be smelted are placed in the upper slot. Its interface can be opened by pressing the use item button on it. The main purpose of a furnace is smelting. In Bedrock Edition, a furnace drops itself when mined by hand or with any tool. In Java Edition, a furnace mined without a pickaxe drops nothing.

A furnace will also drop all of its contents when broken, including XP from smelting items that were extracted by hoppers. They also appear in ancient cities, and one furnace generates in every igloo.Ī furnace can be mined using any pickaxe. Furnaces also generate in some houses in snowy tundra villages, and in one of the taiga/ snowy taiga‌ village houses. Furnaces can be found in plains, desert, and some savanna village weaponsmiths.