Solar water heating (SWH) systems are a mature renewable energy technology which have been accepted in most countries for many years. SWH has been widely used in Israel, Australia, Japan, Austria and China. Now being introduced in many other countries. In a "close-coupled" SWH system the storage tank is horizontally mounted immediately above the solar collectors on the roof. No pumping is required as the hot water naturally rises into the tank through thermosiphon flow. In a "pump-circulated" system the storage tank is ground or floor mounted and is below the level of the collectors; a circulating pump moves water or heat transfer fluid between the tank and the collectors. Heating all water heating requirements including your pool.