http://www.dailymail.co.uk/pages/live/articles/technology/technology.html?in_article_idH1996&in_page_id 65
or
http://tinyurl.com/2hwxqh
"...this is a very efficient replacement for the traditional immersion
heater. We have examined this interesting technology and when we got the
rig operating, we were getting 150 to 200 per cent more energy out than we
put in, without trying too hard."
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