How Solar Water Heating Systems Work - Home Energy Efficiency Guide #1421432 (License: Personal Use)

This diagram shows a residential solar thermal water heating system with rooftop solar collectors, insulated piping, and an indoor storage tank. Red lines indicate hot water flowing downward from the collector to the tank, while blue lines show cold water returning upward for reheating. The system operates in all seasons, supported by backup heating when sunlight is insufficient.

Used on energy efficiency guides, sustainability blogs, HVAC service pages, or government clean-energy resource sites; targets homeowners researching renewable water heating solutions.