This study compares the heating efficiency of the Solar Energy-powered Embedded Pipe Envelope System (SEPES) in various building envelopes using a novel simulation model developed with TRNSYS. The evaluation includes indoor air temperature, inlet and outlet water temperatures in walls, internal surface temperatures of envelopes, and heating energy consumption across six different SEPES installations. Key findings include: 1) SEPES significantly improves indoor temperatures during cold winters in Harbin, with ceiling installations increasing temperatures by up to 8.4℃, and strategic placements optimizing warmth and energy efficiency; 2) Water temperature in SEPES pipes indicates heating capacity, with the highest temperatures in east and west wall installations; 3) Ceiling-embedded pipes perform best in blocking heat loss, with surface temperatures ranging from 7.42℃ to 11.59℃; 4) SEPES installations significantly reduce daily heat loads, with ceiling installations achieving the highest energy-saving rate of 49.7%. Overall, ceiling installations are most effective, followed by the north wall, floor, south wall, east wall, and west wall.