The subject line says it all. The guy who posted this has several videos documenting prototypes he's built. I haven't tried this out for myself but I could see it working really well for a greenhouse or chicken coop. Maybe even supplemental heat for a house...
nifty thanks for sharing wow there arew hole a Bunch of people posting vids of these things.so many designs hmm. think i'll need to get on making some of these for my shop and house. now if only i actually drank soda ,or canned beer. so much for good taste tomorrow's recycling pickup day,maybe i should go scavenging