Hi Fishy,
I've been reflecting on my comments with regards to high heat and in fairness, I've never cooked on anything anywhere near 7kw, so for me to totally dismiss it was wrong.
However, just cooking on my humble domestic gas hob gives me fantastic result so I've never really felt the need to go higher.
I cooked a madras tonight for my supper, and with this thread in mind, I carefully observed the activity going on in the pan. There was a furious amount of bubbling happening, easily as much as I'd seen previously on you tube links or the East web cam. So, I'm quite satisfied with the output from my hob but I know Jerry feels that his 7kw burner gives him better results. Jerry without doubt, puts a hell of a lot of effort into his cooking and his experiments are of so much value to the forum. I would think it very prudent to take his advise, it's just that I've never be fortunate enough to make the comparison between domestic output levels to professional output levels.
Ray