Weather: winter than other seasons, solar thermal radiation energy is low, water heater heating rate is slow. Solutions: one is to add auxiliary energy heating, common electric heating and gas heating; The second is to increase the area of solar heat collection.

Illumination problem: the sunlight is blocked, the sun can not shine on the collector plate or the illumination time is reduced, thus reducing the thermal efficiency and producing less hot water. Solution: Move the shielding or move the solar collector to get the best light.

Air cause: some places may not have good air quality or sometimes the air pollution is serious, floating matter accumulation on the solar heat collecting surface, affecting the normal work of the solar water heater. Solution: check the water heater collecting surface regularly, accumulate dust and clean in time.

Valve problem: the upper and lower water valves are not closed, resulting in insufficient water temperature of the solar water heater. Solution: replace the upper water ball valve

Water tank capacity: there is no hot water in the water tank or hot water is not enough, the capacity is small, the use of hot water and more than the hot water of the water tank, resulting in water temperature is not enough. Solution: Replace a larger storage tank or use an auxiliary energy heating system.

Water quality problem: water quality is not good, water heater scale affects the efficiency of solar water heater. Solution: clean the vacuum tube, flat solar energy use sewage outlet.