Abstract: A plasma oscillator photonic energy water heater/steam boiler, establishes, amplifies and stores photonic energy in a plasma wherein resonance and temporary energy storage is maintained until energy is transferred on demand by thermal radiation and conduction of molecular kinetic energy to a heat exchanger having water to be heated therein. The chamber is a closed hollow internally reflective mirrored cylinder which includes parallel and optically resonant mirrored surfaces for sustaining a plasma oscillation within the container. A containerized molecular gas media is flooded with broad band electromagnetic radiation in order to create population inversions at the electron level in the gaseous atmosphere, and hence, store photonic energy in the plasma oscillator. Water in a heat exchanger immersed within the plasma is heated by thermal radiation energy transfer, and by conduction from a high molecular kinetic energy stored within the plasma.