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Passive Solar Collector Improvement

 
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Location: 22963
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It is a small but important improvement in the world of passive solar heating.  Brought to you by yours truly.

https://www.youtube.com/watch?v=aQHi8kQDmJI
 
He was expelled for perverse baking experiments. This tiny ad is a model student:
A rocket mass heater is the most sustainable way to heat a conventional home
http://woodheat.net
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