介绍了太阳能热水系统的组成要素，对锅炉加热、电加热、燃气热水器加热三种传统的辅助热源进行了比选，指出选用燃气热水器辅助热源具有节省空间，重启时间短，便于间断使用等优点。%This paper introduced the component of solar hot water system,made comparison and selection to boiler heating,electric heating,gas water heater heating three traditional auxiliary heat sources,pointed out that the gas water heater auxiliary heat source had the advantages of sav-ing the space,short system restart time,convenient to intermittent.
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