Ianto Evans has a book called “Rocket Mass Heaters”. He is a Welsh inventor, who was hired by the government of Guatemala to develop a less polluting wood stove for cooking. It also had to be more efficient. Basic physics tells you that exhaust heat is wasted energy. The smoke out of his stoves are cool enough to put your hand in front of, and they don’t emit visible smoke. They use much less wood as well and can be made for under $100.
EndTimesReport.com has interesting articles on the importance of kerosene heaters, as a way to avoid unwanted attention, for short term unrest, before wood burners are used.
Keep up the good work. – Dan C.