What is a primary application of passive solar water heaters?

Passive solar water heaters are designed primarily to harness sunlight directly to heat water for domestic use, making the production of hot water for homes—such as for showers, baths, and washers—their most significant application. These systems typically involve solar collectors that absorb and transfer heat to the water, which can then be stored in a tank for future use.

While warm water for pools may utilize similar solar principles, the main aim of passive solar water heaters aligns more closely with providing hot water for household activities. This distinction is essential because although other options might involve heating or utilizing energy from the sun, passive solar water heaters specifically generate hot water for residential needs. Therefore, the correct understanding revolves around their primary function, which focuses on providing consistent and reliable hot water in home settings.