Electronic and radio electronic technology developing, one observes  the increase of thermal loads on some elements and units, the demands to ensure their heat regimes are raised. In this regard, some efficient cooling systems which can remove significant heat fluxes at small heat0release surfaces, are necessary, Therefore, lately there widely used the systems, where both convective motion of a liquid heat carrier and a phase transition are used for cooling [1].   The usage of electroconvection to create turbulence of the liquid dielectric heat carrier (one-phase or two-phase) in the heat input region and its transport into the heat removal zone is one of promising directions. The questions of mixing (turbulization) of a heat carrier under the influence of the electric field have been rather well studied [2], however, the formation of an ordered motion of a dielectric medium is a more complicated problem. The devices in which the electric field energy is transformed into the mechanical power of the ordered motion of a liquid dielectric are commonly called as electrohydrodynamic pumps  (EHDP). In the known designs of EHDP, formed in the majority of cases by two or three electrodes, the origin of the liquid motion is associated with the geometric asymmetry of the electrodes. Due to a strong non-uniformity of the electric field near one of the electrodes there appear the conditions for the injection of charges with the resulting flow of the liquid directed to the counter electrode. The pump capacity depends not only on the geometry of the electrodes, the number of stages, but on the electrophysical properties of the working medium. In order to ascertain these aspects there has been studied the characteristics of an eight-stage pump with the net electrodes with different dielectric liquids used as heat carriers in electrohydrodynamic heat exchangers. Every stage consists of two electrodes – the emitter and the collector produced in the form of nets of cords stretched parallel to each other on the round metal barrel at a certain step. The pump stages are mounted in series at a certain distance.   The experimental bench presents a circulation circuit including EHDP, a flow rate meter, a  difference piezometer. As working media there were used transformer oil with electric conduction s = 1 x 10-11 Sm/m, kinematic viscosity n = 28 mm2/s; organosilicone oil with s = 1.36 x 10-10 Sm/m, n = 3.55 x mm2/s; kerosene with s = 1.43 x 10-11 Sm/m, n = 1.55 mm2/s.  It was measured he working medium rate in the circulation circuit, pressure difference at the inlet and outlet of EHDP, leakage current from the electrodes at different voltages. According to the relation of the mechanical power consumed for the pumping through of the working  medium in the circulation circuit to the electric power supplied from the high voltage source there was determined the efficiency factor of EHDP.  The data, concerning the discharge and head characteristics of EHDP as well as its efficiency factor, have been generalized on the basis of the statistic treatment of the current-voltage characteristics using the methods of the similarity theory.  It is shown that the best characteristics of EHDP were obtained in  organosilicone liquid (the maximum pressure difference ~7.5 x 103 Pa, the transformation efficiency factor ~ 10%, three times and half, respectively, as much than in transformer oil and in kerosene). Taking into account that the physical properties do not change under the influence of the electric field, micro discharges,  temperature, it is preferable to use organosilicone liquid as a heat carrier in EHD heat exchangers.