This paper presents the annual performance of an active solar still. Analytical expressions for water and glass cover temperatures and yield have been derived in terms of design and climatic parameters. Numerical computations have been carried out for Delhi climatic conditions (latitude = 28 degrees 35＇ N, longitude = 77 degrees 12＇ E). It has been observed that for given parameters, the annual yield is optimum when the collector inclination is 20 degrees and the still glass cover inclination is 15 degrees.