This　study　investigates　a　proposed　novel　integrated　collector-storage　solar　water　heater　(ICSSWH)　combined　with　lap-joint-type　micro-heat　pipe　arrays　(MHPAs)　and　latent　heat　storage.　In　the　proposed　system,　the　solar　energy　irradiated　on　ICSSWH　is　collected　and　stored　in　a　phase-change　material　via　MHPA　with　fins　attached　to　the　storage　section　inside　the　heat　storage　tank　(HST).　The　stored　thermal　energy　is　transferred　to　the　water　supply　by　two　multi-channel　flat　tubes　attached　to　the　extraction　section　of　MHPA　outside　the　HST.　The　effects　of　environmental　conditions　during　the　four　seasons　and　the　flow　rate　and　inlet　temperature　of　the　water　supply　on　the　thermal　response　of　ICSSWH　are　reported.　The　highest　efficiency　reached　61.5%　and　the　average　extraction　power　and　average　outlet　temperature　reached　1323.3　W　and　42.1　degrees　C,　respectively.　The　thermal　storage　efficiency　of　the　proposed　ICSSWH　is　evaluated　by　using　the　＂normalized　mean　charging　efficiency＂　curve,　the　intercept　and　slope　of　which　are　0.682　and　4.847　WK/m(2),　respectively.　Furthermore,　mathematical　fitting　is　performed　to　obtain　the　function　between　the　mean　outlet　temperature　or　extraction　power　and　inlet　temperature　or　volume　flow　rate　during　the　thermal　release　process.