XtremepowerUS Inground/Above Ground Swimming Pool Solar Panel Heating System 28" X 20' 28" x 20' Solar Collector Each Roll 28" x 20 foot Long (40sq ft.) Quick connect design for easy assembly Quantity of these solar panels needed is dependent on the pool size and the location, which may estimate by some websites. Diverter kit may be required for pumps 1.5hp and greater. Sold separately under item number B01FNE41HA