I agree with Jed. Get a hold of RREAL in Minnesota. We installed a solar furnace/collector on a client's home in Illinois with their help. They were able to give us a BTU rating for the size collector that…"
Some who work to increase energy efficiency and intelligent/wise use of energy are, and some will be, permaculturists. Some are involved in Transition initiatives. Here's a home base for any/all interested in the relationships and prospects.See More
Combustion Appliance Zone Testing (CAZ) Made Easy (March 24, 2016)
-Adapting to the new BPI standard
-RESNET testing requirements
-NFPA testing requirements
-Best practices for best results