Heat radiation travels at the speed of light, which is approximately 299,792,458 meters per second (m/s) in a vacuum.

Here's why:

* Heat radiation is a form of electromagnetic radiation. This means it travels in the form of waves, just like light.

* All electromagnetic radiation travels at the speed of light. This is a fundamental constant of the universe.

Therefore, whether it's visible light, infrared radiation (which we feel as heat), or any other part of the electromagnetic spectrum, it travels at the same incredible speed.