How To Build A Rocket Mass Heater HD

How to build a rocket mass heater using a 4 inch system to work with our chimney! *Note this is an experiment just to see if it is possible. We do not recommend building one unless you want to break the rules! =Rocket Mass UPDATE Video!!= ▶https://youtu.be/d2cYQ_EAG7k =Permies website= ▶http://www.permies.com/forums/recentTopics/showTopicsByUser/155292 =Lazy Pirate Gaming= ▶Youtube https://www.youtube.com/user/echocompanywarriors ▶Follow on Twitter - https://twitter.com/Lazy_Pirates ▶Follow on SoundCloud - https://soundcloud.com/lazypirate-1 ▶Like Facebook - https://www.facebook.com/Thelazypirates Big thanks to all involved! Cheers!