This paper describes the influences which govern solar boc cookers: HS 7534, HS 7033 and newest design HS 5521. The best of solar cooker, type HS 7033 have oven temperature of 202 deg C between 12:00 and 12:45 p.m. on Cctober 7, 1997. Thirty-four units of this type have been field tested since September 1997. It was found that these solar cookers have a good heat storage capability, therfore they can be used for consecutive cooking. The optimization of the size, the aperture area, the insulator thickness, the oven volume and the reflector area leads to a new design, type HS 5521. Its volume is only 35 of the volume of HS 7033 and cheaper. The performance comparison of the last two solar cookers are described based on the data collected during with and without load. The HS 5521 has the same heat collection rate and is able to cook as fast as HS 7033.3
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