Heat Breath is the ability to generate waves of pure heat through a breath. It can be used to undo the effects of Freeze Breath. Dependent on the user, the intensity can be controlled and various effects (like Fire Ball Projection) can be used, too.
- Fire Ball Projection: Advanced users are capable of creating fire balls.
- Phoebe uses heat breath to unfreeze Cherry in Adventures in Supersitting.
- Max uses heat breath to unfreeze Phoebe in Crime After Crime after freezing her for sneaking up on him.
- Max uses Heat Breath to meltwater pipes in Phoebe vs. Max: The Sequel. In the same episode, Phoebe uses the superpower to melt Max's gold-attracting electromagnet.
- When Chloe teleport Max to the North Pole in Robin Hood: Prince of Pheebs, Phoebe uses her Heat Breath to unfreeze him and make him feel warm again.
- When Max finds out Colosso is lying about being sick, Max burns his tuxedo outfit in Parks & T-Rex.
- In Thunder in Paradise, Max burns Evil Phoebe's ATV to stop her getting from the volcano in Hawaii.
- Max can dry his hair by using his heat breath as exampled in Nowhere to Slide.
- In Mad Max: Beyond Thunderhome, Phoebe secretly buys spicy peppers so she could see the various effects on her Heat Breath.
- Phoebe and Max were unable to use their regular Heat Breath as a result of the spices and peppers affecting their superpowers in Mad Max: Beyond Thunderhome.
- In Going Wonkers, Phoebe accidentally burned herself and the flower that Cole Campbell gave her because of her unstable powers.
- Like Nora's heat vision, heat breath can be used to cook food.
- The Thunder Twins do not use heat breath as often as they use Freeze Breath and Telekinesis.