Consider how a solar-powered pool heater works. Your existing pool plumbing pulls the water out of the pool, pumps it through the filter for cleaning and then pumps it back into the pool, where the cycle begins again. A solar pool heating system is installed in the middle of the existing system. Beyond the filter, new pipes are installed that carry the water to the solar panel, where it is heated by the sun's rays and passed back into the existing plumbing to return to the pool. Deciding whether solar heating will work for you requires you (or your contractor) to:
Determine your home's solar resource. Unfortunately, not all locations can accommodate a solar pool heater. While an unshaded area facing due south is best, an area with southeast or southwest exposure that receives a good deal of sun during the day may also provide an option. Some locations just don't get enough sun.
Determine the size of your solar heating requirement. In simple terms, your solar heating panels should equal at least 50 percent of the square footage of your pool's surface. The amount you want to heat the water (temperature rise) will also affect how large an area you need to cover with the panels.
Solar panels used for pool heating are usually unglazed (not covered with glass), which makes them less expensive than the glazed panels used for electricity generation. Solar panels for pool heating are commonly made of heavy rubber or dark plastic treated with ultraviolet (UV) inhibitors to help prolong their life.
The solar panels can be installed on any unshaded smooth surface. While most people put the solar panels on a roof, any open space close to the pool's plumbing is acceptable.
Consider the size of your existing pool pump. Pool pumps are generally sized to accommodate the regular water flow. A larger pump may be required to pump the pool water all the way up to the roof and the solar collector panels.
Install diverter valves in the plumbing to control the flow of water to and from the solar panels. The sun can actually make the water too warm, so you must be able to control whether the water passes through the heating panels or not.