If you follow our recommended solar heater sizes and installation instructions your pool should be six to twenty degrees warmer than it was before you heated it, under the same weather conditions. The larger the solar collector area is, in relation to the surface area of the pool, the warmer the pool water will be. If in the future you decide you want an even warmer pool or you would like a longer pool season, you can add more solar collectors at any time. Vasco Solar can custom design a system for your specific needs.