I have a 250 gal feed /water tank that was converted for my fish tank from my attempt at aquaponics, but at this point, it's just water for the garden. Been looking into rocket heaters.. and the bences are massive, as it the weight.. all that sand weighs alot.
What's interesting about the rocket is it appears to be very commim in rural China you've probably seen this http://www.pyroenergen.com/articles08/eco-rocket-stove.htm
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