The SUN OVEN is often compared with box cookers made out of aluminum foil and cardboard (homemade boxes of various sizes and shapes). See http://solarcooking.wikia.com/wiki/Category:Solar_cooker_plans
for more details on DIY models. While the energy conversion principles are the same, the materials utilized in manufacturing SUN OVENS® have been carefully researched to include the most efficient materials available. In order to capture the maximum amount of energy, achieve the highest possible temperature, and retain the greatest amount of heat, while minimizing the weight, the materials utilized have been selected based on efficiency and quality. SUN OVENS International is determined to disseminate solar appliances that truly meet people's needs rather than distributing perpetuating cookers that work only under the most ideal conditions.