Why does my hotwater bottle step cold after an hour? i hve been haveing probs trying to hold on to it hot...

i hve been haveing probs trying to hold on to it hot but to no avail, pls help!!

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I wrap mine surrounded by a small towel and it keeps me thaw out all dark.

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is it old?
if soo you may stipulation a new one!
Natalie x

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Answers:    newly empty it and fill up on with hot hose

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