Abstract: A generator of ultrapure steam and a corresponding steam generating method uses a heated, fritted refractory glass plate as a water-to-steam interface dividing a first chamber, with water on one side of the plate and steam on the other. Water is continuously injected into interstices of the plate, held fixed in the chamber, where the water evaporates and migrates upwardly to where a steam cloud is formed that exits the chamber and into a second chamber that is a saturation housing where an air stream removes steam from the exit, preventing steam condensation, and delivering a steam jet out of the housing through a port.