This research highlights the possibility of increasing the thermal efficiency of evacuated tube solar collectors by adding fins to the factory fin without changing it. The goal is to harness solar energy at the lowest cost, smallest area, and best thermal performance by using a solar collector with evacuated tubes and heat pipes. The evacuated tube consists of two concentric glass tubes with a vacuum between them. The inner tube contains a carefully selected absorbing layer to obtain the highest absorption. The collector also contains an aluminum fin connected to the absorbing surface on one side and the heat pipe on the other side. Adding additional fins fixed between the fin on the evacuated tube side and the side of the fin connected to the heat pipe, and this addition leads to increasing the heat transfer efficiency because aluminum has a higher conductivity than air, and holes in adding fins get more turbulent, leading to cracking boundary layer and increase heat transfer. Aluminum discs with holes of different diameters were added. The diameters of the holes were calculated as follows (4, 6, 8, and 10) mm, with the number of discs fixed at ten discs for each of the five evacuated tubes in each case, as the experiment consists of two solar collectors, each of which consists of five tubes, the first within the factory specifications and the second to which the above discs were added. To validate the results of the experiment, SPSS was used under identical conditions for the two devices above, and the data were analyzed. The output of the experiment was Tout, and the readings used were the results of the two devices at a flow rate of (0.5, 1.0, 1.5) l/min. The significance criterion was 95%, which was used to evaluate the results of the study and the effectiveness of the additives by comparing the significance calculated at a threshold of 0.05. The model is ranked if the two elements on which the reliability depends are less than a point or 0.05. It is effective in terms of flow rate and type of improvement. If the estimated value exceeds the point or 0.05 limits, no improvement or data analysis will be based on the flow rate and type of increase.