In the building industry solar water heaters are used to heat swimming pools, general hot water and heat transfer fluids used in spatial heating systems. Often, a backup heating system is used for occasions when there is insufficient solar energy to match demand.
Installing a solar geyser makes sense not only for the sake of the environment as it reduces your carbon footprint, but it is also be a money saver in that it will cut electricity costs, however an initial costing outlay is required in fitting one