Crystalline　silicon　heterojunction　solar　cells　are　a　promising　candidate　for　high　efficiency　solar　cells,　and　the　heterojunction　photovoltaic　(HIT-PV)　module　is　strongly　dependent　on　the　temperature.　In　this　study,　we　design　three　heterojunction　photovoltaic　modules　to　improve　the　performance　by　preventing　from　over-heating,　with,　glass,　Tedlar/Polyethylene　terephthalate/Tedlar　(TPT)　and　aluminum　substrates,　respectively.　The　efficiencies　of　those　HIT-PV　modules　are　investigated　under　four　different　outdoor　climates.　The　aluminum-module　shows　the　best　thermal　dissipation;　while　the　glass-module/TPT-module　have　the　better　electrical　efficiency　and　electrical　energy,　since　there　is　the　high　reflectivity　layer　on　the　surface　of　the　glass　(and　TPT)　substrates　rather　than　the　aluminum　substrate.　In　order　to　increase　the　output　power　of　HIT-PV　modules,　we　design　a　heterojunction　photovoltaic　thermal　(HIT-PVT)　system　based　on　HIT　solar　cells　and　aluminum　thermal　collector.　The　measured　results　of　HIT-PVT　system　show　that　the　coolant　circulation　increase　the　output　power,　and　the　HIT-PVT　module　can　provide　the　domestic　hot　water　supply　(up　to　51.2　degrees　C)　under　outdoor　conditions.　In　addition,　the　cost　of　HIT-PVT　systems　are　much　lower　than　those　of　the　conventional　photovoltaic　systems,　and　the　investment　payback　time　can　be　less　than　3　years.