We made our own.. One large empty gas bottle, a welder and some metal for a chimney.. Keeps the house nice and toasty..
Something a bit like this
As already mentioned make sure you use dry wood (not as in wet but as not green) as the sap doesn't burn to well then coats the chimney in creosote resin which burns really well.. We sweep the chimney once a year as well.
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Oh and don;t forget the essentials for it...like this
http://www.amazon.co.uk/Kitchen-Craf.../dp/B0001IX05I