The number of collectors necessary to warm up the water to an acceptable temperature depends mostly of the surface of the swimming pool, the eventual use of a cover and the geographical location of the swimming pool in Europe. As a general rule, we can say that because of the high efficiency of the BLOZOEN solar collectors, only a collector surface of 1/3 of the water surface is required. Each solar collector has a net surface of 4,64m². Your local distributor can make an exact calculation.