Technicals: Nice job exposing this one. You can see the rings have depth to them and aren't blown out.
Subject/composition: Good subject to depict heat. I like the tight crop, which adds an artistic aspect to an otherwise dull subject.
Suggestions for Improvement: The only thing I'm not too sure about is the negative space at the top. It really doesn't do anything for me with this subject or how I read this photograph. So I'm wondering if maybe a square crop would be better or shooting at a higher angle so more of the rings filled the top?
Nice shot, I would have liked to have seen the entire burner without cropping the sides off, but I like the contrast of the red against the deep black.