Solar water heaters — also called solar domestic hot water systems — can be a cost-effective way to generate hot water for your home. They can be used in any climate. solar water heaters can replace up to 100% of the electricity used to heat water, and solar water heating should be considered as one of the first steps in energy and cost savings, providing a better return on investment than other renewable energy saving or generating technology in the Uganda environment.

Solar water heating systems include storage tanks and solar collectors. Solar water heating collectors capture and retain heat from the sun and transfer this heat to a liquid. After installation, properly maintaining your system will keep it running smoothly.


How the solar water heater system works?

All solar water heaters do the same thing. They collect heat from sunlight and irradiation through the solar collector and transfer that heat to water which is then stored in a tank. The solar collector is generally a flat plate collector or an evacuated tube collector. More basic systems may be a coil of black pipe within a box or similar. The levels of efficiency are determined by quality and size of the collector. Although there are over 120 solar water ‘high pressure’ systems tested and passed by the Uganda Bureau of Standards (UNBS), and more that have not passed the rigorous testing process, they all set out to do the same thing. That is, to heat water from the sun and to store the hot water.

High Pressure and Low Pressure systems


The pressure of the water determines the type of overall system you require. If ‘high pressure’ water comes out of your tap, you will need a ‘high pressure’ solar water heating system. If the water flows with no pressure, only using gravity, it will generally be a ‘low pressure’ system. Most homes with an existing electric geyser will require a ‘high pressure’ solar water heating system. Lower income homes that have no existing hot water boiler are generally fitted with ‘low pressure’ solar water heaters.

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