Solar water heating systems use free heat from the sun to warm domestic hot water. A boiler or an electrical heater can be used to make the water hotter, or to provide hot water when solar energy is unavailable.
Maintenance costs for solar water heating systems are generally very low. Most solar water heating systems at first five-year or ten-year require little maintenance.
Solar water heating systems can achieve savings on your energy bills. Typical saving from a well-installed and properly used residential system has a payback period of 2 years when replacing electric heaters. However, savings will vary from user to another.