In the solar world, there isn’t much regular maintenance needed for most systems that harness the sun’s power. What you do need to be cautious of, is who you allow to service the equipment. First, I always recommend that you go to the installing company. If that is not an option, you will need to be certain that the company you choose has experience with your type of system. For solar thermal systems, this is much more important than solar electric systems. This is because solar thermal systems tend to be more complex and also less understood by many contractors that claim to ‘know’ these systems. Frequently, I have seen that because a solar system installs one type of new domestic hot water system, they feel that they know all systems. This is like saying that you sell Toyota cars, so therefore can fix all vehicles, old and new!
When selecting a company to service your equipment, be sure to ask them if they are familiar with that equipment. How long have they been in the solar industry? and do they have liability insurance. When I get service calls from potential clients, I can frequently tell what kind of system they have from them answering only a few questions.