The performance of evaporative condensing system (ECS) with built-in small electrohydrodynamic pump (EHDP) at various working conditions and peculiarities of heat- and mass transfer in it were studied in [1]. This work, being a natural continuation of previous research, presents the results concerning the influence of space orientation of ECS on heat transfer coefficient α in the evaporator and deriving the relation for its quantitative estimation as a function of angle φ ,  characterizing the position of ECS in space, α ( φ ). ECS represents a closed rectangular loop (Fig. 1). The evaporator and vapor condenser are built-in in parallel to each other in two opposite branches. The EHDP is built in the third branch while the forth branch is used as a heat conducting channel (AB), connecting the evaporator and the condenser. The hear carrier (n-hexane) is pumped by EHDP in the direction from A to B (Fig. 1). The position of the loop in space is defined by the rotation angle φ relative to the axis perpendicular to the loop plane.  It is measured from a vertical vector g (0<φ <2 π ) in a clockwise direction. The initial position of ECS, φ =0, is shown in Fig. 1. Heat transfer coefficient was found experimentally for three positions of the ECS (φ =0; π /2; π ) as it is shown in Fig. 2. The input power and the current were 48.5 W and 3.12 μА, respectively. Each point on the graph represents the average value of several measurements.