>JD> I can't imagine a heating system where the steam is
 >JD> deliberately allowed to escape.
 > 
 > I thank Ken for the fine example. Refineries caring about efficiency?
 > It just has to be one of the all time oldest oxymorons around.
I've seen steam tracers (my wife worked in a refinery for 25 years). 
I forgot about that, but don't really consider that a 'heating system' in the 
context of our discussion.
And if you don't think that refinerys care about energy efficiency, you just 
haven't ever been close to one. One of their biggest costs of operation is 
energy input, and believe me, they spend a LOT of money to increase 
efficiency wherever possible.
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