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the thermos is only good for a short while but might be difficult to make - flooding a cool engine with hot water could cause thermal shock.............in this sense the heat recovery form the exhaust is better I think as it works on demand.
from what has been said so far the best system might be a form of water cooled EGR, so you let the warm gasses in, and since this is the stuff doing the warming it should warm the coolant up just as quickly.
Or............instead of wriapping copper microbore around the exhaust put the exhaust into a pipe and seal the ends, then pass water through the pipe.
A big problem is when the exhaust gets too warm, any water will be very close to if not already boiling no matter how much antifreeze is put in.....this is another reason why I favour an EGR approach (or even running a dead end off the exhaust which is smaller so will not get as hot which is cooled via the coolant system???)
If doing anything like this I was thinking of putting the outlet of the warm water on the inlet side of the engine but it would need time to mix well too or there would be seams of VERY hot water running through which isn't altogether good for the cylinder head.
sorry for the long post.
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