Solar water heating systems usually require very little maintenance. However, if you do that little bit of maintenance the system can last 50% to 100% longer. The recommended schedule is an annual service and a major tuneup every 5 years.
There are two parts to the annual service, tank/panel flush to eliminate buildup of calcites and dirt and system inspection. The flushing method depends on which part of the island you live in. If you live in a part of the island with a lot of dirt in the water the Complete Flush is needed each year. For most of the island only the Short Flush is needed for years 1 – 4 and the Complete Flush every 5 years.