Moved my reply from another thread to this thread.
Copper with wort is an interesting topic, after a cautionary comment by Darren regarding copper on another thread, I did a bit of google and found a lot of interesting articles (didn't note them but could dig them up if need be). There seemed to be 2 schools of thought, 1 that the modern diet contains not enough copper and the other that it contains too much. I'm not armed with the training to tell fact from fiction. However the few measurements of copper in beer that were published were found to be well short of the 2mg recommended intake. Though beer is also listed as a good source of copper which would tallie with the breweries I've seen which contain copper kettles but maybe not with SS breweries that I suspect would make up the majority of beer produced.
Hopefully someone can confirm/expand/deny this, but, short term contact with copper at high temps will not leach too much copper and could be of benefit to the yeasties in fermenting your wort. However it seemed that long term cold storage of a slight acidic liquid (beer or even water with some article reporting high levels of copper in tap water due to old copper pipes) in contact with copper would leach unaccpectable levels of copper.
Edit, I have copper HLT, and copper piping in the Mash tun and in the kettle, hence the interest in copper
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