The　water　temperature　of　building-integrated　photovoltaic/thermal　systems　is　an　important　indicator　of　building　space　heating.　However,　in　the　winter,　this　system＇s　heat　loss　is　significant,　and　the　low-temperature　water　cannot　meet　building　heating　standards.　Meanwhile,　previous　research　on　building　envelopes　integrated　PV/T　heat　pump　systems　have　primarily　focused　on　the　performance　of　systems　installed　on　limited　roofs　of　buildings,　which　conflicts　with　the　requirement　for　energy　consumption　in　metropolitan　high-rise　buildings.　This　study　proposes　a　photovoltaic/thermal-heat　pump　system　(BIPV/T-HP)　mounted　on　the　building　facade　to　solve　this　problem,　and　a　numerical　model　is　developed　to　assess　the　heating　performance.　The　results　showed　that　increasing　the　flow　velocity　from　0.05　m/s　to　0.5　m/s　reduces　the　mean　outlet　water　temperature　from　16.11　degrees　C　to　9.55　degrees　C,　but　increases　the　operating　times　of　the　heat　pump　from　6　to　8　in　January,　and　increases　the　heating　capacity　of　the　BIPV/T　-　HP　system　from　58.6　kWh　to　90.5　kWh　over　the　entire　heating　season.　Meanwhile,　higher　temperature　thresholds　raise　mean　water　temperature　and　increase　heat　loss,　resulting　in　a　reduction　in　heat　pump　output　from　111.3　kWh　to　50.2　kWh.