I just stumbled onto this site recently - never even heard of "permaculture" before - but there's some pretty cool stuff in here! Hmmm wonder if I can convince my wife to quit our jobs and live off the land for a while. Probably not gonna fly... Anyways, I thought I'd throw a few opinions out there for those experimenting with variations in home heating systems: 1. Buy a carbon monoxide detector. This is especially true if you are experimenting with your own designs for combustion related heating systems. 2. Make sure you understand the insurance consequences if you are inventing your own or making modifications to your heating systems. There are lots of product and installation codes around heating systems intended to protect public safety. Odds are your insurance policy has clauses that render your insurance void if "illegal" products contribute to property damage.
Solar Station Construction Plans by Ben Peterson -- ebook