 Rocket stove designs are most often used for portable stoves for cooking but the design is also used for large fixed stoves in institutions, and to make rocket mass heaters for heating.In field tests in India, rocket stoves used 18 to 35 percent less fuel compared to the traditional stoves and reduced fuel used 39-47 percent compared to the simple traditional open three-stone fire, as well as a large reduction in emissions.A precursor to the rocket stove was the argand lamp, which was patented in 1780.