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Approved Installers of Kwiksol Solar Geysers


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What to look for in a solar geyser

You’ve decided to go the eco-friendly route and install a solar geyser. Installing a solar geyser in your home means that you contribute to the solution.

The technology of solar is used widely overseas. From this, South Africa is now taking advantage of the ample sunshine. If you’re looking to buy and install a solar geyser but don’t know where to start this is the guide you need – a few factors you should consider before buying a solar geyser.

Indirect or direct system

Direct systems: are best suited for frost-free areas, allowing for the water to be heated directly.

Indirect systems: are best suited for homes that are situated in areas that experience frost. Indirect systems allow for the water to be heated through a heat exchange mechanism.

Tank size

The size of your tank is dependent on the amount of people living in your home. Allocate 50 litres of warm water per person. In addition, budget an extra 50ℓ of warm water for general domestic usage. With these calculations in mind, you’ll be able to estimate the tank size best suited for your home. A general rule of thumb is if your current traditional electric geyser is for instance a 150ℓ tank, then the solar geyser should be a 200ℓ tank.


South Africa is fortunate to experience an abundance of sunshine from the far north to the far south of the country and therefore the aperture areas of the solar absorbers (solar collector panels and evacuated tubes) do not have to differ by area. What is important though is that the current size aperture is used with the correct size solar geyser.

For example, a 150ℓ solar geyser would use one 2m² solar collector panel or 12 evacuated vacuum tubes. In areas that experience extreme hot weather (+30°C), the water in the solar geyser can reach boiling point. To alleviate this, a thermostatic mixing valve in included in the solar installation, which allows cold water into the system when the water reaches a pre-set temperature.

Split and Close Coupled Systems

There are two types of systems, namely a split pumped system and a close coupled thermosyphon system.

Split pumped system The placing of the solar geyser at a lower level and away from the solar absorbers, such as in the ceiling or at floor level, whereby a pump is used to circulate the water between the solar geyser and the solar absorbers.

Close coupled thermosyphon system The placing of the solar tanks outside on the roof and above the solar absorbers and the entire system is joined. The natural laws of physics apply whereby the hot water rises and automatically circulates between the solar geyser and solar absorber.

These are just a few important factors to consider before settling on a solar geyser. It’s essential that you consider geography, the number of people living in your home and of course your budget.

Source: Kwikot

Retrofit Solar System (High Pressure)

The solar retrofit conversion system is specifically designed to convert an existing installed Kwikot or any other make or brand of high pressure electric water heater with a working pressure of 400kPa or 600kPa with a storage capacity of 150lts and 200lts, into a direct solar water heating system.

The system is suitable for all climatic conditions (frost and frost free locations) and works on the pump circulation method with an array of evacuated tubes.



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A heat pump works like an air conditioning unit in reverse. It extracts heat from the ambient air surrounding it, enabling it to heat the refrigerant which is then compressed causing it to get even hotter. This is then run through a heat exchanger in which the water is heated. The refrigerant is then allowed to expand again, thus cooling it down and enabling it to again absorb heat from the surrounding air. So only a little electricity is used to run a fan and compressor while the heat energy is provided indirectly by the sun.

The modern domestic heat pump is a very efficient water heating device which uses a small amount of electricity to drive a compressor which forms the heart of the heat pump. The heat energy produced is as much as four times the electrical energy used to drive the compressor.