Multifunctional heat preservation type groundnut stove. You can buy a special oven for baking sweet potatoes. The price is about 700 yuan, multifunctional insulation type groundnut stove to sealed steel tube as a heating conductor, so that the fire source and food 100% completely isolated, at a certain temperature in a full range of continuous uniform grilling, not only fast, good quality, mobile, color and aroma are good, safe and environmentally friendly. And there are nine grills, a grill can put about three sweet potatoes. More affordable. So stall baked sweet potatoes with multifunctional insulation type groundnut stove is more affordable.