热水循环系统是解决由于中央热水系统管路较长，导致用热水之前不能及时用上适宜温度的热水（俗称：放冷水）的一种的高科技产品。
通过改进，热水循环系统得到合理的配置，并获得很大的经济效益。
After improvement, the hot water circulation system was rationally collocated. Meanwhile, good profits were received.
探讨了燃气常压热水供热锅炉房燃气供气系统、热水循环系统、报警系统等的安全设计。
The safety design of gas supply system, hot water circulation system, alarm system and so on in atmospheric gas hot-water heating boiler room is discussed.
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