By integrating pre-filtration with PE-Xc piping, we have developed a whole-house instant hot water system that delivers hot water in just 3 seconds, significantly reducing cold water wastage. The pre-filtration effectively safeguards the pump impeller and check valve, ensuring quieter operation and extending their service life. The high-flow filter bottle maintains a consistent hot water temperature without any attenuation over long pipeline distances, meeting the requirements of the five-constant environmental control system. Additionally, the system supports remote scheduling and timed circulation via an APP, offering intelligent energy savings while balancing comfort and cost-efficiency.