Fires provide warmth to prevent damage. Players get cold slowly at day and quickly during the night. Once empty, every tick chips off some of your health, making fires necessary for survival.It is advised to not stay too close to the center when using a campfire or the big fire, or else the player can start taking damage, which is not very noticeable and can kill the player.
CampfireCampfire is the lowest fire tier. It can easily be crafted with 30 Wood and 5 Stone. It burns out (disappears) after 2 minutes (half of a night). Campfires are also used to craft Big Fire (40 wood, 10 stone and campfire).
Big FireBig fire is a type of campfire that lasts longer. The big fire burns out (disappears) after 6 minutes. Big fires are crafted from campfires.
The furnace is a reusable fire that behaves like a one-way-chest, players can put any amount of wood into its inventory, but it is not possible to take it out again. As long as the Furnace contains at least 1 wood, it will give out heat. However, 1 wood will "burn" every 6 seconds, and disappears from the furnace's inventory. When empty, it only acts as a wall, being impassable.
For each night, around 48 wood gets used as fuel in the furnace. Try not to dump all of the wood, or it will most likely get wasted during daytime. When afk, make sure that you are in the range of your furnace.