阳能热水器结构图:1、水箱外壳(water tank shell)2、保温层layer for heat preservation3、水箱内胆inner water tank4、排气溢流孔vent holeand overflow hole5、密封胶圈6、外水箱端盖end cover of the outer tank7、防尘圈a loop of dustproof8、电加热器预留孔镁棒安装孔heater9、真空集热管evacuated solar collector tubes10、进出水孔inlet&outlet hole11、漫反射板diffuse flat te reflector12、护罩尾托tailstock13、支架support