This study introduces a passive heating system for well-insulated low-rise buildings, utilizing a heat pipe-driven radiant floor system directly connected to the earth. Distinguished from conventional radiant floor systems, this approach eliminates moving parts and functions passively during winter, offering enhanced energy efficiency and sustainability. Simulations in Shanghai's hot summer and cold winter climate zone reveal that the system's energy-saving potential is influenced by indoor temperature setpoints and the water temperature in horizontal heat pipes. Further evaluations in Beijing (cool summer and cold winter climate) and Guangzhou (hot summer and warm winter climate) demonstrate different performances. In colder climates, the system's effectiveness reduces, while milder winters see significant energy savings. The study concludes that this passive heating system can be highly effective in regions with mild winters, but less so in colder climates. The importance of climatic considerations in the heat pipe driven passive heating system design is highlighted, contributing to sustainable building practices and energy conservation.