Question: Are there different sizes for the SolarAttic Pool Heater?

Answer: No. There is one size heat exchanger and it is provided as either an automatic or manual system or just the heat exchanger itself for those that have existing automation systems with solar options. The most popular solar attic pool heating system is the AUTO SYSTEM. At current manufacturing costs, cutting our ratings in half still result in 90% of the cost structure but half the pool heating benefits. Therefore, the PCS3 is a one size optimized design for residential pools. Large commercial pools can make use of multiple units if needed, A button-link to the Auto System details is found under the "Technical Data" MENU. Also, see "System Configurations" under this same MENU to compare options available.