What to do when solar hot water system is not in use?

When a solar hot water system is not in use, especially during periods of low demand or maintenance, it's important to follow certain steps to ensure its proper functioning and longevity. Here are some recommendations:

Drain and Protect from Freezing:

If you live in an area where freezing temperatures occur, it's essential to drain the water from the system to prevent damage. This is particularly important for evacuated tube and flat plate collectors. You may also use an antifreeze solution in the system to protect it from freezing.

Turn Off the System:

If the solar hot water system has manual controls, turn off the circulation pump and any other components associated with the system. This helps to conserve energy and prevent unnecessary wear on the system.

Isolate the Solar Collectors:

If the system allows for it, you can isolate the solar collectors from the rest of the system to prevent heat loss through convection. This can be achieved by closing valves or using isolation mechanisms.

Check for Leaks:

Before shutting down the system, inspect it for any signs of leaks. Addressing leaks promptly can prevent damage and maintain the efficiency of the system.

Monitor Temperature and Pressure:

Keep an eye on the temperature and pressure levels in the system. If you're using an antifreeze solution, ensure that it remains at the appropriate concentration to prevent freezing.

Secure Electrical Components:

If your solar hot water system includes electrical components, make sure they are secure and protected. This includes covering control panels and ensuring that wiring is properly insulated.

Regular Inspections:

Perform periodic inspections even when the system is not in use. Look for signs of wear, corrosion, or damage. Regular maintenance can prevent issues from escalating.

Consider a Winterization:

If you live in an area with harsh winters, consider hiring a professional to perform a winterization service on your solar hot water system. This service typically includes draining the system and ensuring it is adequately protected against freezing conditions.

Keep Records:

Maintain a record of system shutdown procedures and any maintenance activities performed. This documentation can be helpful for future reference or for professionals servicing the system.