Solar water heaters mainly heat water through the accumulation of heat energy during the day. The heat is limited. If it is rainy, the heat will be less. In addition, there are many people in the university. Generally, the amount of hot water heated by solar water heaters is not enough for all students.

Air energy water heaters are heated mainly by absorbing low-temperature energy through special media. Compared with solar water heaters, they have higher thermal efficiency and can always heat hot water. However, the storage of hot water is limited, and the bathing time in universities is generally concentrated, so there may be a shortage of hot water. However, compared with the solar water heater, there is another advantage that there is no hot water now, but it will be available in an hour or two, and the solar water heater can only wait for tomorrow when it is used up that day.