A year-round performance of a new design of a solar water heater with natural circulation was studied experimentally at Amman, Jordan (latitude of 32°N and the altitude of 985 m above sea level). The measured parameters were temperatures of ambient, water inlet, and outlet of the collector; the temperature of the heated water stored in the storage tank, and the solar incident radiation on the tilted angle. The obtained results showed that the performance of the solar water heater depended highly on both of the flow rate through the collector and the solar tilted incident radiation. A typical day analysis of the system showed a high solar collector efficiency especially around mid-day (a time when it receives the highest solar energy). Also, data revealed that the maximum total useful heat gain without water consumption was 200.55 MJ recorded during September, while the maximum useful heat gain with water consumption was 304.81MJ recorded during October. Meanwhile, the maximum daily efficiency without water consumption was 54% recorded during May, while the maximum daily efficiency with consumption was 55% recorded during September. Based on the results of this study, the new design of a solar water heater can be recommended for the optimal use of solar energy to heat water.

在约旦安曼（纬度为32°N，海拔高度为985 m），通过实验研究了具有自然循环功能的新型太阳能热水器的全年性能。测量的参数是环境温度，集热器的进水和出水温度；储存在储水箱中的热水温度，以及太阳入射辐射的倾斜角度。所得结果表明，太阳能热水器的性能在很大程度上取决于通过集热器的流量和太阳能倾斜的入射辐射。对系统进行典型的日间分析显示，太阳能收集器效率很高，尤其是在中午左右（这是接收最高太阳能的时间）。另外，数据显示，不消耗水的情况下，最大的总有用热量增加为200。9月记录了55 MJ，10月记录的最大有用热量随水消耗为304.81MJ。同时，五月份的无用水情况下的最大日效率为54％，而九月份的有用水情况下的最大日效率为55％。根据这项研究的结果，可以建议采用太阳能热水器的新设计，以优化利用太阳能来加热水。