Pinner says: One day, I will build one of these Rocket mass heaters. Less wood, exhaust is just steam and CO2, heat from one fire lasts for days, you can build one in a day and half, and people have built them for under 20 bucks. I'm sold.
This is by far the most technically advanced innovation I’ve found for a five gallon bucket so far. Sam Redfield developed this design to provide a source of electricity that can be built cheap and hooked up to any source of flowing water – including irrigation systems, creeks and streams, or even sewage systems.