I got ya. I too have one of those pools for the girls but it is a 8 ft one. I took a black hose and put it on the roof of the house and ran a 12 volt pump to the pool to heat it up. It can get way hot. If I had a solar panel
it would work for free. It was just a test to see how it would heat it up. I now have a non working water heater in the attic to catch the attic heat to warm up the water before it goes into my reg water heater. I don't think my water heater ever kicks in no more.