You can boil water with adequate voltage. The water offers resistance to the current. As with anything that offers resistance, the current will heat it up and eventually it will boil.
Here is a video of a person boiling water after making homemade electrodes out of razors.
https://www.youtube.com/watch?v=q2r0GMVAWyI
Getting a gas to condense back to a liquid by adding energy is a tall order.
Another option is technically not a phase change of a single substance, but a change of a liquid to a different gas and back again: electrolysis of water to constituent hydrogen and oxygen, then electrically catalyzed combustion of hydrogen and oxygen back to water.
You can electrolyze water (H2O) into hydrogen and oxygen gas by passing a current through it.
http://www.instructables.com/id/Separate-Hydrogen-and-Oxygen-from-Water-Through-El/
You can turn the hydrogen and oxygen gas back into liquid water, again by passing a current through it. The voltage at sufficient energy will ionize the gas into plasma forming a spark. The heat from the spark will catalyze the combination of hydrogen and oxygen back into H2O.
You can accidentally boil water with your electrolysis apparatus if you do not pay attention and you deplete the electrolyte. As you deplete electrolyte, resistance of the water increases and it heats up.