I have, genuinely, just taken this picture. A young man of my acquaintance regularly sits on my settee taking pictures of what is on the television, and it was too good an answer to the prompt to not copy him when I was watching Brian Cox's series on The Planets, as you really wouldn't get much more heat than this!
And now for the photos I took earlier today for this prompt! We haven't had a lot of heat over the past few weeks, but just enough for these flowers to bloom. They are, officially, Kniphofia. But their relevance to the prompt is that, here, they are known as Red Hot Pokers.