There may be various reasons for small water output from solar water heaters, here are some common reasons and solutions:

1. Water pressure problem

Reason: If the tap water pressure in your area is low or the tank is not located high enough, it may cause the water heater to produce a small amount of water. Water flow from a split solar water heater usually depends on water pressure.

Solution: Check the water pressure in your home and, if necessary, install a booster pump to increase it.

2. Clogged pipes

Cause: There may be scale, impurities, or air clogging in the pipes, affecting the water flow. After long-term use, especially in areas with hard water, scale tends to accumulate in the pipes, resulting in a smaller water flow.

Solution: Clean the pipes and collectors and check for blockages. If the scale is serious, consider using a descaler or hiring a professional to clean the pipes.

3. Valve problems

Cause: The inlet and outlet valves of the water heater may not be fully open, or there may be damage or clogging inside the valves, which can also lead to low water flow.

Solution: Check whether the inlet and outlet valves are fully open, and replace the faulty valves if necessary.

4. Insufficient water level in the water tank

Cause: If the solar water heater's water tank is not enough, the water output will naturally become smaller. This may be because the water replenishment system is not normal, or the tank float valve failure, can not be normal water replenishment.

Solution: Check the water level of the tank to ensure that the water replenishment system works properly, and replace the float valve if necessary.

5. Collector temperature is too high

Reason: In the case of very hot weather, the high temperature of water in the collector will lead to water gasification, resulting in poor water flow or small water output.

Solution: You can adjust the water flow, or add an automatic temperature adjustment device in the water heater system to avoid high water temperature affecting the water output.

6. Air blockage (air plug phenomenon)

Reason: air into the piping system, resulting in water not flowing smoothly, the formation of the so-called air blockage phenomenon, resulting in a smaller amount of water or even no water.

Solution: Open the exhaust valve or other exhaust device to remove the air in the pipeline and restore normal water flow.

7. filter clogging

Cause: Some water heater systems are equipped with filters in the water inlet or piping to filter impurities. A filter that is clogged with dirt or impurities will also affect the water output.

Solution: Check and clean the filter regularly to ensure smooth water flow.

8. Problems with the design of the solar water heater

Cause: If the design of the water heater is not suitable for the installation location or usage in your home (e.g. the collector is too far away or at an inappropriate angle), it may also lead to insufficient water flow.

Solution: Check the installation of the equipment. If there is a design or installation problem, it may be necessary to adjust the position of the collector or improve the system design.

Summary:

Most of the reasons for low water output are related to water pressure, piping, temperature, or valve problems. Firstly, you can start with water pressure, pipe cleaning, and valve checking, after eliminating the simple problems, if you still can't solve the problem, it is recommended to contact the professionals for a comprehensive inspection and maintenance.