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Revision as of 13:10, 20 May 2017 by Gangsir (talk | contribs) (Minor history typo)
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The boiler is used to convert Water into Steam. When fueled it converts feed water into steam at 165 degrees, matching the maximum temperature of the Steam Engine. Boilers have 2 water connectors, allowing them to pass feed water through to other adjacent equipment but only 1 steam connector.

1 unit of steam is produced for each unit of water. Fuel is consumed at 50% efficiency, which means that a single unit of Coal (8MJ) fed into a boiler and then utilised in a steam engine will result in 4MJ of energy added to an electrical system.

Boilers are the main source of pollution in the early and midgame.

Inserter can take from boiler

You can insert into boilers, but also take fuel out. See this post and follow ups.

This can be also used to create an early filter-device, which filters only fuel items: One inserter inserts into a boiler (not connected to water) another take the fuel out.


  • 0.15.10:
    • Steam became a separate resource, boilers now produce Steam rather than high temperature water that is displayed as steam
      • This distinction is meaningful for circuit network accounting of steam and the coal liquification recipe
  • 0.15.0:
    • New graphics.
    • Changed boiler dimensions to 3x2.
    • 'Steam' is produced on a separate connector rather than heating water passed through.
      • At this time, steam is actually water that is renamed when over 100 degrees.
    • Significantly increased energy consumption/production.
  • 0.13.0:
    • New fire graphics for boilers.
  • 0.6.1:
    • Boilers show their fuel inventory in the entity info.
  • 0.5.1:
    • Boilers are now fast-replaceable with pipes.
    • New boiler graphics.

See also