richsoil.com/heat About an hour is taken from the DVD and then mashed into an 8 minute summary. In this excerpt from better wood heat, Ernie and Erica go over the basic steps involved in safely designing and planning a rocket mass heater build, from beginning to end. First the heater placement and the exhaust outlet position are discussed. Also discussed is the proper selection of clay for a successful build and how to get moisture to evenly penetrate the clay particles for a nice smooth cob. Firebrick setup is important in maintaining a properly functioning rocket mass heater. Watch as the team of builders carefully select and then meticulously place each brick to avoid any gaps or potential for movement over time. Erica also talks about chimneys, discussing height, placement, and some of the mistakes people make in choosing a chimney. Next up is the placement and fitting of the manifold, which is the most difficult and most important aspect of making a RMH fire burn effectively. See how the manifold for this build is modified for accurate fit using a sheet metal "nibbler". The team then sets up the duct-work, heat riser, and insulates the interior with a durablanket and wire mesh to keep it all in place. From there, the cob placement begins in courses of 6-18 inches each, to allow for even drying. Time and patience is key at this time.The top barrel is placed and sealed with heat resistant tape while Erica talks about the importance of making sure there are no leaks in the system where cold air can get in and disrupt the functioning of the heater. The rocket mass heater is then finished with a plaster coating for a beautiful and smooth surface.
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Thanks to Dan Ohmann of The Grass-fed Homestead channel for helping me with the editing:
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