Pool Area and Collector Size Multiplier

This map shows the recommended proportion of pool collector area to the pool’s surface area for various regions in the United States. Local installers may use different ratios depending upon factors such as the desired pool temperature, shading considerations, and a less-than-ideal roof orientation.

Although the ratios may seem counterintuitive, they relate to the typical pool season in that region. For example, a SPH system in Florida may be heating the pool during nine months, while an SPH system in Wisconsin may be in operation only three months of the year.