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The Heat property determines how fast particles are emit from the Fire object. It is limited to the range [-25, 25]. Positive values are in the top (+Y) direction of the parent BasePart or Attachment. It also affects the ParticleEmitter/Acceleration of the inner particles. Below, you can see the effects of higher heat on the velocity/acceleration of the flame particles (left has Heat = 9, right has Heat = 18).

Two torches - the left has Heat = 9 and the right has Heat = 18

Code Samples

Lighting Torches

This code sample adds Fire to all BasePart in the Workspace named “Torch”.