I bookmarked a bunch of sites on youtube about rocket stoves last summer and was thinking along the same line of op, with a twist i was thinking steam see this ---> https://www.youtube.com/watch?feature=player_embedded&v=EY6QOB8pql8
Then I saw a way to fuel the steam and keep the kids busy...
+1 on the TD4
I now use a TA4 and a pulse wave modulator and am happy with them... but after reading the spec sheet on the TD4 I'm going to order it from here.
http://www.newegg.com/Product/Product.aspx?Item=9SIA1KT0JK2470
This Forum has tought me so much about Beer and about the equipment to make it, building a bar / man cave, and the confidence to walk in a bar order a beer take a sip ... then slap my forhead and say I COULD HAVE HAD A HOME BREW.
Thank you
Tony L