the Rocket Mass Heater Builder's GuideHeating with wood is often considered a natural and economical alternative to electricity or fossil fuels. However, even with a fairly new and efficient woodstove, many cords of wood are required for burning over the course of a single winter, and incomplete combustion can contribute to poor air quality. A rocket mass heater is an earthen masonry heating system that provides clean, safe, and efficient warmth for your home, all while using 70 to 90