"Proper installation and smooth functioning of solar heaters depend on variety of factors such as solar resource, climate, local building code requirements, and safety issues. Always consult a professional expert to know suitability of installing one in your house. Maintaining a solar heater is not a very heavy task. If you have a passive system you will not need much maintenance. As for active systems they require the same maintenance as that of a traditional water heater. They can be professionally maintained in every 3 to 5 years by a solar contractor. Systems with electrical components usually require a replacement part or two after 10 years. However in active systems, glazing may need to be cleaned in dry climates where rainwater is not available to wash it. "