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# Factorio Runtime Docs Version 2.0.77

# ProductionType - Runtime Docs

## ProductionType :: union

Specifies how the entity will utilize this fluidbox. `input-output` should only be used for boilers in fluid heating mode.

#### Union members

`"none"` |
`"input"` |
`"input-output"` |
`"output"` |

Concept used in

- LuaFluidBoxPrototype::production_type