How can you make the claim of heating with one tenth the wood? Wouldn't that be like claiming to function at 750% efficiency? I think the most you can improve is maybe 10%. Regular wood stoves are 75% efficient now. How is a rocket mass heater different from a regular wood stove? Is a rocket mass heater cleaner than natural gas heat? These are both the products of the leaders in rocket mass heater innovation, Ernie and Erica Wisner, who have built more than 700 rocket mass heaters. Followed by the rocket mass heater that was created from that design. The first picture below represents the most thorough rocket mass heater design I have ever seen. It is also the place where it gets so hot that all of the smoke is burned.Ībove is a much better image showing the mighty power of the insulated heat riser, reburning the smoke and powering the whole system.Ī quick video I made to explain how a rocket mass heater does what it does: The strong convective current is what makes the air get sucked in through the wood feed so that the fire burns sideways and the smoke doesn't come out. The real magic happens with the heat riser. The gasses that exit are usually just carbon dioxide and steam. When the hot gasses hit the barrel, it gives off a lot of heat, which cools the gasses which get much smaller and easier to push around. Since the heat riser is insulated, it gets freaky hot. Neat! I sat on one that had not had a fire in it for 24 hours - it was still hot! The smoke doesn't come back up because a huge amount of air is getting sucked into the wood hole. The exhaust is near room temperature - and very clean. The fire burns sideways? No smoke? If a conventional wood stove is 75% efficient, doesn't that mean the most wood you could possibly save is something like 25%? How do you have a big hole right over the fire and not have the house fill with smoke? I was skeptical.Īnd then I saw one in action. When somebody first told me about rocket mass heaters, none of it made sense. And they burn so clean, that a lot of sneaky people are using them illegally, in cities, without detection. Some people have reported that they heat their home with nothing more than the dead branches that fall off the trees in their yard. This could be the cleanest and most sustainable way to heat a conventional home. The verbose details on rocket mass heaters
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