The increase of specific heat loads, the presence of electric high intensity fields  in various devices, the growing requirements to the reliability of  maintenance of the prescribed thermal parameters calls for development and application of some evaporating cooling systems of a new type – closed-loop electrohydrodynamic systems with an active regulation. Thus, it is necessary to continue the in-depth investigation in the sphere of hydrodynamics and heat transfer in electric fields, including phase transformations.  In the cases when the source of heat generation is in a limited space under some high electric potential and for its electric isolation from the surrounding walls, some liquid dielectric is used. It is preferable to use the method of the influence of an electric field on heat transfer. So, it is of great interest to study the effect of the obstruction parameters on the boiling process under the conditions of some field action with the purpose to forecast the burning characteristics of these devices.  The characteristics of the boiling process on the profiled surface immersed into a free bulk of a liquid under the conditions of an electric field action at ambient pressure have been investigated in this work. Heat carrier is hexane with the boiling point 68.7 C. The obstruction conditions, such as the change of the clearance between the heating surface and the counter electrode, were created due to the traveling electrode arranged in the upper part of the chamber. Experimental  results showed the decrease of  the interelectrode gap causes the increase  of the superheat of the heat transfer surface and, correspondingly, to the  reduction of the heat transfer rate (see the picture) .  The obtained results can be explained by  the fact that when  the heat flux density increases, there  takes  place the  deterioration of the   conditions of the heat carrier access to the heating surface because of the formation and accumulation of vapor bubbles within the interelectrode gap.   At large interelectrode gaps the rate of heat transfer approaches that under the conditions of boiling in a large volume. In spite of the deterioration of the heat transfer conditions at the decrease of the clearance in the interelectrode gap, it is shown that the influence of the electric field results in the enhancement of heat transfer with the doubling of the heat transfer coefficient.