Paul Wheaton joins Tall Paul to talk about Rocket Mass Heaters, their efficiency & why you might want one.  From his article, "rocket stove mass heater" on richsoil.com, Paul writes:   "rocket mass heaters in a nutshell: heat your home with 80% to 90% less wood exhaust is nearly pure steam and CO2 (a little smoke at the beginning) the heat from one fire can last for days you can build one in a day and half folks have built them spending less than $20"More info:  Permies Forum: Rocket Stoves & Rocket Mass HeatersPaul Wheaton's 4 DVD Setpermies.comPaul Wheaton will be one of the keynote speakers at the permacultureVoices Conference in March 2014.  Visit Tall Paul's Website:PermacultureCentral.com