A solar panel (10) has tubing (12) through which water from a swimming pool is recirculated. The tubing (12) is adapted to be exposed to the sun for heating the water to a temperature whereby the pool is heated. The solar panel (10) has a housing (14) for the tubing (12), and the housing (14) has a transparent screen (16) covering the tubing (12). In use, the housing (14) retains heat therewithin for increasing the temperature of the tubing (12) above that outside of the housing.