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@Bernhard
Simon you may be right but eventually all flasks, even the bloody good ones will lose heat, the option to reheat a liquid is a novel idea which is all we're going for at the moment. This is merely an exercise in innovation and product development, ergo we have to try and do something that hasn't been done before.
Will take your comments for my report though if that's ok, unless you have done the questionnaire and you left comments there.
Thanks for your input.
PS. didn't really answer your first point.
Not sure it defeats the purpose of a vacuum flask, the flask we are 'designing' is a vacuum flask, we haven't specified how it would perform next to regular flasks and will never know without doing some thermodynamic calcs (not necessary so will not happen, plus we don't have a final design). The re heating flask is supposed to give the user the option to re heat their liquid of choice, it is not a facility created because the flask performs badly. I realise flasks are designed to keep liquids hot (or cold) for a long time but having the option the re heat the liquid may interest people and may even change the way people use flasks.
Of course it might not have any interest what so ever and in that case our cash flow summary will look a bit dire!