Solar pool heating system prices for a residential pool can range anywhere from $2500 to $7000. The location and size of the pool, location of the solar panels, desired temperature and season, and type of pool equipment determine system size and costs.f a pool owner heats their pool with natural gas through the normal swimming season, an investment in solar can pay for itself in 2 to 3 years. If the pool owner does not have a gas heater or wish to use one, solar will not really “save” money, but the pool will be much warmer and more inviting.