A distiller that utilizes waste gas from a small electric generator was proposed and analyzed theoretically to determine its thermal behavior and the productivity of the distillate. Waste gas from small electric generators has not been effectively utilized because of the low thermal capacity. However, the thermal energy can be used as an additional heat source for solar distillers. The distillers consists of a number of vertical parallel partitions in contact with saline soaked wicks, and a heat-pipe is used to transfer the thermal energy of the waste gas to the distiller. In the distiller, the latent heat of condensation is recovered and recycled to increase the productivity of the distillate. We found that the thermal energy of the waste gas can be utilized effectively in the distiller, and the hourly productivity of the proposed still with 10 partitions was predicted to be about 5.5, 3.3 and 1.9 kgm⁻² when the flow rate of waste gas at 250°C is 32.8, 16.4 and 8.2 m³hour⁻¹. This indicates that the distillate of the proposed still after a few hours of operation would be almost equivalent to the maximum value of the experimental results of daily distillate produced by solar stills whose solar absorbing area is 1 m².