The 48cm tall 'Suntastic' panel cooker, which I have originally constructed, is capable of raising the internal temperature of an empty, 4-liter black metal pot, with a clear glass lid, to 150° C in about 30 minutes. If a greenhouse enclosure is used, the temperature can reach about 180° C. 2 cups of rice can be cooked, without a greenhouse enclosure, in about 100 minutes, and 3 liters of water heated from 26° C to pasteurization point, 70° C, in about 50 minutes.