effect on pool temperatures

Even in Spain, temperatures of the pool are only of a comfortable swimming temperature (27°C) for 2 months of the year because of the effect of lower night temperatures and wind on the summer shoulder months. With a solar pool heating system, the swimming season can be extended by up to 5 months, even longer with a pool cover, elevating the pool temperatures by 4°C, and with a cover up to 6°C.

The difference in pool temperatures over the year in a typical outdoor 8m x 4m swimming pool in the Valencia region.