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In this study, the effect of simultaneously using two active and passive methods, namely the magnetic turbulator and the helical coil wire (HCW) turbulator, on the hydrothermal parameters of a double tube heat exchanger is being evaluated for the first time. The results are also being compared with those of a simple heat exchanger, a heat exchanger equipped with a magnetic turbulator, and a heat exchanger with a HCW turbulator insert. Finally, the most optimal option is selected using TEF. Tests have been conducted using different pitch ratios of the HCW turbulator (ranging from 2.5 to 10) and fluid flow rates (ranging from 0.5 to 4 l/min). According to the results, the usage of the HCW turbulator, magnetic turbulator, and the simultaneous use of both turbulators increases heat transfer by 237 %, 262 %, and 491 %, respectively. Additionally, the pressure drop in the presence of these two methods is 3.8 times that of a simple heat exchanger. Furthermore, with the help of TEF, the heat exchanger armed with both turbulators is chosen as the optimal option, achieving a TEF of 3.78. • Magnetic turbulator and HCW turbulator were utilized separately as well as in combination in a DTHEX. • Effect of the pitch ratio of HCW on hydrothermal parameters of a DTHEX was investigate. • Heat transfer in the simultaneous presence of two turbulators is up to 3.8 times of the simple DTHEX. • The highest amount of TEF was observed in the simultaneous presence of two turbulators (TEF = 3.78). • The pitch ratio of 5 was chosen as the most optimal pitch ratio using TEF. [ABSTRACT FROM AUTHOR]