Maintenance costs for solar water heating systems are generally very low. Most solar water heating systems come with a five-year or ten-year warranty and require little maintenance. Once fitted your installer should leave written details of any maintenance checks that you can carry out from time to time to ensure everything is working properly.
Perhaps the most important thing for you to check for is whether there are any leaks. Leaks of anti-freeze will produce a strong smell (even if you can’t see any liquid). If you notice this you should contact your installer. If you are not getting hot water or the solar pipework is cold when the pump is running on warm, sunny days then you should contact your installer. For peace of mind some installation companies offer an annual service check.
You should have your system checked more thoroughly by an accredited installer every 3-7 years, or as specified by your installer. It is likely that after this period of time, the anti-freeze that is used to protect your system in the winter months will need to topped up or be replaced as it breaks down over time reducing the performance of your system. Anti-freeze lasts better if the solar water system is used throughout the year and not left unused during the warmest weeks of the year. This cost of replacing the anti-freezer is usually around £100.
The other thing that your installer should check is the pump. In a well maintained system, pumps can last for more than 10 years and cost approximately £90 to replace.