This Sun Coast solar heater puts out 80,000 btu of heat. On a sunny day the water temperature can rise as much as two degrees Fahrenheit per hour. By using the solar heater in the daylight hours, using a bypass valve arrangement at sundown and covering the pool with the solar cover, a comfortable water temperature can be maintained as long as the overnight air temperature stays above 50 degrees Fahrenheit. The net result is that the swimming season can be extended about a month over what would normally be possible.
The reel for the solar cover was added during the 2004 swimming season. Before we installed the solar reel we had to pull the cover off onto the lawn then fold it up. This task is not easy to do because some of the water remains trapped in the folds making it very heavy. It was too heavy for my wife to move it. After I folded it, I would drain as much water as possible and store it on the picnic table when it was not in use. The other bad thing is that grass clippings would get into the pool.
However, there is one precaution that one must take when storing a solar cover on a reel. The solar cover can be damaged if left in full sun without being covered by an opaque sheet of plastic or something to reflect the heat that builds up inside the solar cover. I solved the problem by folding the bottom side back over the reel since it has a silver finish and reflects the sunlight. After I folded it back I used a bungee cord at each end of the reel to prevent the wind from unfolding the cover. Notice the introduction picture at the top of this page for this method.