Hello all, newer pool owner from Ohio! My pool is a 15' x 48" Intex above ground (4,400 gallons). My pump is Intex Krystal Clear filter pump model 637R. I was hoping to get a small heater for the pool! Where my backyard is has a few trees that make it harder to have warmer water. I have a cover that helps a little, but you cannot really swim when the sun goes down because it gets really cold. And it's also pretty limited to swim until later in spring and not far into fall. I know it's a basic pool but I have no idea what type I can get to help raise the temp a little. Again I don't need anything fancy, just a little push to help so I dont break the bank! No gas or propane hookup from my house to use. Any ideas?