Abstarct: Water is one of the most important elements of the earth, its saline resources are very high and its sweet resources are very low and difficult to access. Desalination of seawater or effluents is a great alternative to prevent rapid depletion of available freshwater. Conventional desalination processes are associated with high energy consumption. Solar energy can be used to prevent environmental pollution caused by fossil energy consumption. For this purpose, in this research, the evaporative water-desalination system with the simultaneous use of a vacuum tube equipped with a heat and reflector tube has been investigated experimentally. First, the heat absorbed by the vacuum tube is transferred to the evaporator chamber using a heat pipe, and then the water vapor produced will be distilled and fresh water will be produced by passing through a helical coil into the heat exchanger tank. The use of two flat and parabolic reflectors next to the tube without reflectors has been evaluated. Also, two oil and air fluids were used separately as filling fluid inside the vacuum tube and its results on fresh water production were recorded and studied. The experiments were performed in two modes: using a solar simulator in the laboratory environment and outdoor experiments in winter. The results using a simulator showed that the use of flat and parabolic reflectors in high radiation increases production by 3 and 6% and in low radiation by 33 and 67%, respectively. Also, using the oil fluid inside the vacuum tube instead of air improves the performance of fresh water production by up to 64%. Finally, the proposed solar water heater-desalination system baxsed on this method, which includes 40 vacuum tubes with oil fluid equipped with heat tubes and flat reflectors, is proposed and presented.