Tar Kiln

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Tar Kiln
Tar Kiln.png
Vital statistics
Size 4.5 x 4.5
Skill(s) RequiredSpecific needed skills.<br>The default skills every Heartling starts off with, Oral Tradition, Primitive Tools & Wilderness Survival), are ignored. Charcoal Burning, Pottery
Object(s) Required Clay x50, Stone x35
Required By (3) Coal, Everglowing Ember, Tar
Repaired With Clay
Can be Lifted No
Hit Points 400
Soak Value 2
Go to Objects
Icon keyboard.pngBuild > Buildings & Construction > Furnaces & Fireplaces > Tar Kiln

The tar kiln is used to get coal from wood blocks or boards. It also produces Tar as a byproduct, which you can take out in a bucket or barrel.

How to Use

Fill it with blocks or boards, then light the tar kiln using a torch or other fire source. The tar kiln can hold 80 blocks or 40 boards, and it takes 83.3 RL Hours (1.2% per hour) to burn no matter how much wood is in it. Each block becomes 2 coal, one board equals 1,5 coal.

Use inspect to check %.

Icon keyboard.pngAdventure > Inspect


Tar Kiln Q =

Tar and Coal Q = (note: n.n5 output values are randomly rounded up or down to n.n)

The color and amount of smoke produced varies.


  • Due to saw quality’s ability to increase the quality if boards sawed, boards are usually higher quality than blocks. It is recommended to use them for making high Q coal.
  • Blocks are lower quality than boards, but they produce more tar and coal.
  • When adding blocks/boards to the tar kiln, the quality of the blocks/boards will average after each addition. If you want to make high Q coal, avoid putting in any lower Q blocks or boards.
  • As of World 10, it now takes about ~3.5(83.3 hours) days real-time to finish burning coal.
  • As of World 10, the kiln must be at least half full to start.
  • Different types of wood yield different amounts of tar. Pine blocks yield the most tar, followed by other coniferous trees.
  • Tar kiln can keep a maximum amount of 10 liters of tar.
  • A full kiln of pine blocks yield nearly 20 liters of tar, so if you don't collect it halfway you'll lose half of the yield because the kiln is full.
  • It takes approx. 2 minutes and 45 seconds to produce 0,01l of tar from pine wood.
  • As of World 11, higher Q tar kilns finish faster than lower Q kilns. (Debunked - currently my q206 kiln finished at the same rate as a q22 kiln)


  • A wheelbarrow can be used to get all the coal from a Tar Kiln, no matter how many coal the kiln contains. (ie: not limited to coal stockpile limit) ...

Game Development

  • Tar Plow (2021-05-23) >"You can now Shift+Right-Click "Tarkiln"s, to draw as much as you can from them as you would from a normal container. You can also use wheelbarrows to empty Tarkilns directly."