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@Bernhard
Ok, fair enough.
We intend to use the same idea as [ame="http://www.amazon.co.uk/Magic-Gel-Reusable-Hand-Warmer/dp/B000MU4IJ2"]these[/ame], currently they only heat up to about 55C but we are looking to get it hotter, it will be placed inside the vacuum next to the liquid holding bit. They are reusable, so once used you can fill the flask with boiling water and it will put that energy into the warming gel, the reaction is started by snapping the silver element in the gel. We intend to have a button on the handle to cause this reaction.
I have an intermediary report that you can read if you want, it's 55 pages or there abouts, although a lot of it is appendices.
Bobby, I wasn't interested in putting up the technical details of it as I didn't think it was important, I guess I was wrong.
If you want anymore info please let me know.
Bern
PS, Thanks for taking part.