<p>Cassie Langstraat recently visited Wheaton Labs in Montana and was given a tour of their new rocket stove mass heater. The unique aspect of this heater? It’s located in a teepee. A rocket stove mass heater runs on 80-90 percent less wood compared to normal heaters and the heat from one fire can last for days. Apparently you can also build one for less than $20. Credit: YouTube/Cassie Langstraat</p>
