Condensate electrowetting purge in evaporators (heat exchangers) based on the force balance at the three-phase contact line (TCL) is used in a prototype heat exchanger. The electrowetting is described based on overcoming the static three-phase contact line friction and detailed droplet physics is presented. Series of experiments was performed under various conditions and it was found that electrowetting combined with hydrophobic coating improves the drainage rate by as much as factor of three. Observations show that fins subjected to electrowetting are cleared of liquid droplets, in contrast to the fins which are not. Based on the proposed physics and experimental data, optimized electrode designs for future reference are proposed.