TDSS is a significant improvement on prior approaches to water sterilization. TDSS utilizes a continuous thermal fluid flow process, to sterilize fluid to a high sterility assurance level (SAL). Sterilization is achieved by passing the fluid through a heating section to super heat the fluid to such a degree as to sterilize any living transmissible agents including fungi, bacteria, viruses (including COVID-19) and spore forms in an economical and environmentally responsible way, no matter the level of contamination of the source. The system operates within prescribed ranges for pressure and temperature to achieve the desired level of sterilization without need of maintaining a fixed temperature or a fixed pressure within any portion of the system, including the heating section, no other water treatment system can make this claim.