Friends who camp regularly have these: http://www.outdoorgear.co.uk/eshop.asp?wci=product&wce=53902001&CameFrom=png
Even on a dull damp day in England they warmed up enough for a decent shower & hair wash for a medium sized lass with long hair. On the HOT day, they were warm enough in a hour.
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Kate XXXXXX
Mad sewing witch!
http://www.katedicey.co.uk