KISS
This works as Stan describes.
Just normal water. Plates/submerged. No heat. Not steam. Water stays cold. Nothing special there.
The plate gap is important to be small. With a tiny gap, it helps to capture the gas as it gets stuck between the plates or tubes making it easier to clear the water between them. This in turn decreases the capacitance of the WFC requiring adjustment of the voltage and pulsing frequency. Keep doing this until all water exits the tubes and voltage is at its peak.