Solar cooker: 1. Energy saving 2. Environment-friendly 3. No money consumption 4. Time to boil 5L water need 15mins Advantages of solar cooker: 1. you can only use the sunlight to boil water, steam bread, cook rice, stewed pork ribs etc without coal, electricity, faggot, cost nothing. As per boiling 3 pots one day, you could save cost fuel about 200US $ per year, that is to say it is long term ...