Yes that is right, but if you get a day with sun all day and warm temperatures (20-25 degrees C, 70-79 degrees F) it can climb about 15 degrees, it is recommended for a pool size like mine (8200 gal.) that you have two of them. Yes one does take up a lot of room but you can get a kit (or make one yourself) so you can lean one up onto the side of the pool and lay the other one on the ground. the biggest problem I had was setting it up, the 2 panels that came in it were rolled up together and it was hard unrolling them and keeping them unrolled so the sun could soften them up to make them more flexable, the second problem I had was leaks at 3 places where the water entered, the bypass valve, and where the water exited, I used plumbers tape on the threads and tightened them up really good but still ended up with leaks (a whole roll of duct tape on each one fixed that, lol)