Fuel

This page was last verified for Vintage Story version 1.20.6.

Different materials have different burn times and temperatures. Different processes also require different temperatures, duration, and potentially fuel types. Cooking requires a temperature of at least 100°C, while firing a clay mold in a pit kiln requires certain fuel items such as firewood, peat or coal. Smelting most ores, metals, or glass requires much higher temperatures.

Wood

All logs burn at 800°C, while most other wooden materials burn at 600-700°C, which is a temperature high enough for cooking, and smelting certain metals such as Lead , Tin , Zinc and Bismuth . Firewood can also be used in pit kilns to fire items made out of clay.

Image	Wood Type	Duration (s)
	Acacia Log	89
	Bald cypress Log	72
	Birch Log	78
	Ebony Log	110
	Kapok Log	47
	Larch Log	72
	Maple Log	79
	Oak Log	98
	Pine Log	60
	Purpleheart Log	72
	Redwood Log	72
	Walnut Log	72
	Aged Log	40
	Wooden Planks Blocks	20
	Stacked bamboo	24
	Firewood	24
	Wooden Slab/Stairs Blocks	10
	Board	6

High Temperature Fuels

These fuels generate temperatures high enough to be used in a pit kiln to fire pottery items made by clay forming, smelting ores for casting , and in smithing . Be sure to check the temperature required for your process and choose your fuel accordingly. Charcoal, black coal, anthracite and coke (but not brown coal) can all be used in a bloomery , but note that the type of the coal used in a bloomery, under a steel cementation furnace , or in a forge does not matter and does not change what can be smelted in it or how long it takes.

Image	Name	Temperature (°C)	Duration (s)
	Firewood	700	24
	Peat	900	25
	Brown coal	1100	77
	Black coal	1200	84
	Anthracite	1200	196
	Charcoal	1300	40
	Coke	1340	40

Calculating Fuel Cost

Here is what is currently known about the fuel calculations for smelting nuggets or bits in crucibles:

"Warmup time" refers to the amount of time it takes to heat up a given number of nuggets to its smelting temperature

"Smelting time" is the amount of time it takes for a given number of nuggets to be melted down (filling the green arrow up), not including warmup time

• There is no difference between placing the nuggets in a single slot of the crucible or splitting the nuggets evenly between all four slots.
• The warmup time is the same regardless of the number of nuggets in the crucible, assuming the type of nugget and fuel are the same.
• The warmup time is directly related to the smelting temperature of the nuggets, and inversely related to the burn temperature of the fuel.
• The smelting time is directly proportional to the number of nuggets smelted, if kept at the smelting temperature for the full duration. Double the nuggets means double the smelting time.
• The smelting time is inversely related to the burn temperature of the fuel used.
• The smelting time of 40 nuggets of any kind is ~60 seconds, if kept at the smelting temperature for the full duration. This also means the smelting time of a given number of nuggets is not dependent on the type of nugget.

Alternative Fuels

Most items made of wood and cattails (baskets, chests, other furniture) will also burn in a firepit. In an emergency, you might not have the fuel you need. Before you burn your household goods, you might also use these flammable items.

Image	Name	Temperature (°C)	Duration (s)
	Dry grass , Cattails , Papyrus	600	4
	Bundle of bamboo stakes	700	10
	Torch	600	6
	Flowers and other plants	600	10
	Rot	400	12
	Fat	400	96
	Stick	300	8