NOVELTY - A water heating system uses solar energy via solar panel, a conventional immersion heater (5) powered by a battery (3) or mains supply, and a wind turbine (6) generating power. The solar panel may include a black anodized aluminum heat exchanger (2) with fins or ribs, and may be tilted at an angle and connected to a water storage tank (1). The heater keeps water heated at night time or in absence of sunlight by using wind turbine generated power.    USE - Water heating system for providing continuous supply of heated water in all weather conditions during day and night time. Can also be used in households.    ADVANTAGE - Provides simple water heating at low cost, since system uses solar energy to heat water. Solar panel with aluminum heat exchanger is flat-shaped and can be easily installed on roof or on ground, providing households with affordable system with long working life. Heat exchanger can be combined with closed flow system, allowing heat exchanger to be also used for purifying or distilling water. Immersion heater powered by battery or mains supply or by wind turbine continuously maintains heated water even at night time or in absence of sunlight. Inlet and outlet of water storage tank are respectively attached to lower and upper ends of heat exchanger enhance and accelerate heating of water in tank via convective flow. Black anodizing, high conductivity of aluminum and higher emissivity allows effective higher heat absorption to heat water and provides highest source of solar energy. Lid may be incorporated to tank to protect water from debris and foreign bodies. Ultraviolet protected tray insulates heat exchanger to ensure constant temperature once heated by solar energy. Distance between plastic sheet and heat exchanger may be 5 to 100 millimeters to minimize shadow castings over course of day as well as reduction in volume due to heat. Spigot can be fitted to tank to draw off hot water manually without removing lid, and allows system to be connected to domestic plumbing by adapting to roof installations. Use of heater and wind turbine further enhances temperature rise and reduces time duration for heating.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method relating to a water heating system.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of a water heating system.    Water storage tank (1)    Heat exchanger (2)    Battery (3)    Immersion heater (5)    Wind turbine (6)