Maintaining a solar water heater can be a challenge, but it is worth it in the long run. Here are a few tips to help you out:
Regularly check the seals and hoses to ensure they are intact and free from debris.
Clean the solar panel and the collector area with a mild soap and water solution every two weeks.
Check the fluid levels and add fluid if necessary.
Check for leaks and fix them as necessary.
Inspect the insulation and replace it if necessary.