Solar Water Heating

We supply and install the following SABS approved solar water heating products


  • Solar water heating systems

  • Solar swimming pool heating


Selecting a solar water heating system

First of all you need to consider system Integrity


  • It is very important to choose the correct supplier to install your solar water heating system.
  • Solar water heating system integrity mainly depends on the installer skills, knowledge & experience as well as product quality.
  • Based on our experience we believe that 90% of all solar water heating system failures and customer dissatisfaction are due to incorrect installations.
  •  It is our objective to deliver and install a quality product with solar integrity.


What system to choose


Make sure you understand what solar system to install.

Step 1   You will have to select between a Direct system and an Indirect system. The decision will mainly depend on regional climate and/or the water quality in your area.

Step 2   You need to decide between a Thermosyphon system and a Split pumped system. The decision may depend on your personal preference for aesthetics rather than cost and efficiency or visa versa.
Step 3   You may also decide between a Complete solar system and a Retrofit solar conversion. Budget will normally be a deciding factor in this case. 
Direct Systems


  • Direct systems are used in frost-free locations where the ambient temperature never falls below 5°C and where the water quality is good. Direct systems are suitable for all our coastal areas including Mossel Bay, George, Sedgefield, Knysna and Plettenberg Bay.
  • Direct solar water heating systems transfer water through the thermal collector that eventually flows directly through the geyser to the end application.
  • Direct systems can be used with solar collector panels or evacuated tubes.


Indirect Systems


  • Indirect systems are used in locations where frost occurs and where the ambient temperature falls below 5°C in winter.
  • Indirect systems are also recommended where the water quality is poor.
  • In an indirect system a propylene glycol & water mixture is circulated through the solar collector panels, transferring solar energy into the heat exchanger and in turn heating the water in the geyser.
  • Indirect systems are recommended for Oudtshoorn and Prince Albert areas in our region.


Thermosyphon Systems


  • Thermosyphon solar water heating systems work on the natural principle that hot water rises and cool water sinks. As water is heated it expands and so, as gravity pulls down the relatively heavier cool water molecules, the warmer molecules rise up.
  • During the day water in the solar collector is heated by the sun. As the water heats up, it rises pushing up into the tank installed higher than the collector. Cooler water at the bottom of the geyser is then pushed down to the bottom of the solar collector where it is further heated. These cycles will continue throughout the day to heat the stored water in the geyser.
  • Thermosyphon solar water heating systems are normally installed on-roof, but can be installed in-roof where the pitch roof is more than a 34 degree angle and the in-roof structure allow for such an installation.


Split Pumped Systems


  • A split pumped solar system is where the geyser is installed below the solar collector panel and where a circulation pump and an intelligent system controller is required to circulate hot water from the panel to the geyser, and cold water from the geyser to the panel for further heating.
  • The intelligent system controller (Geyserwise) monitor temperature differences between the panel and the geyser and regulates pump instructions accordingly.
  • The split pumped system is a little less efficient than the thermosyphon system due to the longer transfer distance between the collector and geyser where some of the heat is lost in-transit.
  • Split pumped solar systems are still a favourite in South Africa due to it’s aesthetics with only the solar collector visible on the roof.
  • Split pumped solar systems are more expensive due to the additional cost of the circulation pump and the system controller required.
  • Split pumped solar systems will require more maintenance than a thermosyphon system over time due to more working parts and electronics involved.


Retrofit Solar Systems


  • The solar retrofit conversion system is specifically designed to convert an existing high pressure electrical geyser into a direct solar water heating system.
  • Most 150lt and 200Lt electrical geysers can be converted into a solar water hearing system.
  • A retrofit system is suitable for all climatic conditions (frost and frost free locations) and works on the pump circulation method with a flat plate collector or evacuated tubes.
  • Heat loss in a retrofit conversion will be higher than the heat loss in a solar geyser due to the fact that a solar geyser is better insulated.
  • A solar retrofit conversion will be cheaper than a complete solar system due to the fact that the existing electrical geyser is used.
  • The retrofit conversion system will function on the same basis as a split pumped system where the geyser is installed below the solar collector panel and where a circulation pump and an intelligent system controller is required to circulate hot water from the panel to the geyser, and cold water from the geyser to the panel for further heating.


Our Products

Solar geysers

  • Kwiksol Direct geysers with a 5-year product warranty
    100Lt, 150Lt, 200Lt & 300Lt Direct solar geysers
  • Kwiksol Indirect geysers with a 5-year product warranty
    150Lt, 200Lt & 300Lt Indirect solar geysers
  • GAP Direct geysers with a 5-year product warranty
    150Lt & 200Lt GAP Eco Green Direct solar geysers
  • Xstream Direct with a 7-year product warranty
    150Lt & 200Lt Solartherm Direct solar geysers

Solar panels/collectors

  • Kwiksol collectors with a 5-year product warranty 2sqm, 2,2sqm & 2,5sqm Panel collectors
  • Powerz-On collectors – with a 10-year product warranty






Solar water heating savings
  • A 150Lt electrical geyser will consume 10,63KW to heat from 15°C to 55°C.
  • If you heat your geyser once a day your heating cost will amount to R20.72 p/d or R621 p/m based on a unit cost of R1,95 p/KW.
  • Based on an annual average a 150Lt solar geyser will require only 1,07KW p/d to heat the same. Cost will therefore reduce to R2.08 p/d or R62.40 p/m.
  • A 150Lt solar geyser will save you R6801 per annum in year one and R146,770 over a period of 15-years if one assume a 5% annual price increase.
  • A complete solar water heating installation will have a payback of approximately 3-years.
  • The return on your investment will be approximately 14% (after tax)
  • Based on an annual average a 200Lt solar geyser will save you R8432 per annum in year one and R181,841 over a period of 15-years if one assume a 5% annual price increase.
  • Based on an annual average a 300Lt solar geyser will save you R11,691 per annum in year one and R252,282 over a period of 15-years if one assume a 5% annual price increase.

Be energy wise, solarise!


Other savings options

You can still save on energy cost without installing solar, the following are good examples. It only require some discipline.

  • Showers use less water than baths
  • Aerated shower-heads use less water than normal shower-heads.
  • Lower the temperature of your geyser from 70 degrees to 60 degrees, or even 55 degrees.
  • Insulate all the hot water pipes leading from the geyser to reduce heat losses.
  • Switch off your geyser during daytime or install a digital timer or geyser wise controller to manage heating temperatures according to your needs.

Maintaining your solar water heating system

What maintenance does a solar system require?


Solar systems do require servicing to ensure you extend the life of your system.

  • All steel geysers (solar and electrical) do have a sacrificial anode that may need replacement from time to time depending on water quality of the region. The sacrificial anode protects the geyser against corrosion. The not replacement of sacrificial anodes are one of the main reasons why geysers fail.
  • Indirect solar systems may need replacement or top up of glycol & water mixture to ensure continuous efficiency.
  • With direct solar systems you may find possible build-up of minerals and other deposits in the collector that may affect the efficiency of a solar system and may therefore need flushing to remove the build-up.
Our service strategy
  • We firmly believe that you will extend the life of your solar system by servicing it on a regular basis.
  • We recommend at least one service every second year.
  • Based on our customer installation records we will remind you annually (or per your alternative request) to service your system.

Our services include:

  • Check if geyser and solar panel is still working correctly.
  • Check the quality of your geyser’s anodes and replace where needed. Cost of the anode will be for your account if replaced.
  • With indirect systems we will top up the glycol & water mixture to improve system efficiency. Cost of glycol will be for your account.
  • With direct systems we will flush the solar panel to drain possible build-up of mineral and other deposits to improve system efficiency.
  • Clean the surface of the solar panel to improve efficiency
  • Check that the element is working correctly and that the timer or system controller setting is still correct. Cost of the element will be for your account if replaced.
  • Clean the pressure control valve to improve water flow.
  • Paint lagging on the roof between panel and geyser that are exposed to the sun to ensure a longer life for the insulation material.
  • Clean and paint external galvanised connection ports of the solar geyser with anti-rust to ensure protection.
  • Based on your request we will replace insulation material where needed. Cost of the material will be for your account.
  • Inspect the system to eliminate possible future problems with vacuum breakers, air relief valves, etc.
  • Inspect the stand and mounting condition to ensure safety and inform the owner accordingly if repairs is required.

Duration of a service :  1 to 1,5 hours

Supply & Installation terms and conditions

Terms and conditions


  1. This quotation is valid for 14 days (if not specified on our quotation) and subject to a Solar4eden final on-site technical evaluation.
  2. A deposit specified in our quotation is required before commencement of installation and the balance upon completion of the installation.
  3. Solar4eden will disconnect your existing electric geyser system free of charge, however, disconnecting will exclude the following:  (a) Change in piping to the existing system,  (b) Additional material required in doing so and (c) The removal of the existing geyser/s.
  4. Pipe work and extra material & fittings used on your existing geyser system, household plumbing and the removal of existing geyser/s will be charged at standard labour rates and will be added per hour for your account.
  5. Any additional piping, special materials & travelling will be charged at standard rates where applicable.
  6. If any outstanding balances are not settled within 30 days after the installation date, interest will be charged at prime plus 2,5% from date of installation. Solar4eden will charge an administration cost fee of R50 per notification of non payment after the said 30 day period mentioned above.
  7. The system(s) remain the property of Solar4eden until paid in full.
  8. A cancelation fee of up to 10% of the total purchase price will be charged if the transaction is cancelled after the deposit is paid. All costs associated with cancelation of the transaction after installation will be for the customers account.
  9. Solar4eden provides no warranty in respect of the individual products as all warrantees are offered by the manufacturer of the individual products: (a) Product warrantees will be indicated on the Solar4eden quotation and may differ according to manufacturing specifications. Our Solar systems normally offer a 5 and 10-years warranty depending the specific manufacturer. (b) Our Copper & Conex fittings, Circulation pumps and Geyserwise systems are guaranteed for 12-months. All solar water installations require the installation of a 400KPA pressure control valve to ensure validity of a product warranty.
  10. Customer’s existing plumbing must be SANS compliant, if not, a list will be created with all the non compliant facts stipulated on it which will be either signed off by the customer to leave as is (the customer will be responsible to make it compliant before installation) or will be replaced and made compliant by Solar4eden for the customer’s account.
  11. Solar4eden will only be held responsible for the plumbing done on the Solar system and the existing household plumbing that forms part of this installation where Solar4eden plumbs into including 30cm from our connection point on existing plumbing.
  12. Agreed installation date will be re-scheduled if weather conditions won’t allow for safe installation.
  13. All our installations comply with PIRB & IOPSA standards and our workmanship carries a 12-month guarantee.
  14. The indirect systemis suitable for inland areas with minimum temperatures below 4°C and for areas with poor- or varied water quality (frost-proof with Propylene Glycol). The direct systemis suitable for coastal frost-free areas with consistently good water quality (<600ppm).
  15. All our systems are 400KPA (required on a solar installation) high pressure & geysers are solar specific IPX4 rated with electrical back-up.NB All product warranties are voided if a 400KPA are not installed.
  16. With reference to retro fit conversions note that Solar4edenquotations does not include any other upgrade of potential non complainces on your existing electrical geyser installation. You have the choice to allow us to rectify shortcomigs at additional cost or accept status quo.
  17. Solar4eden call-out fees are applicable for all call-outs.
  18. Where applicable Customer will obtain all permissions and consents from relevant Landlords & Estate Governing Bodies, Local Municipalities and so on, which are required before the work can be carried out.
  19. With regard to new buildings the customer and or developer requesting the work needs to ensure that the geyser is sized and installed as per approved municipal plans for the building as Solar4eden cannot be held responsible for any deviation in ths regard. Any cost of any deviation in this regard will be for the customer/ developer’s account.
  20. Risk of ownership of material and goods transfer to the contractor/owner on delivery/placement of material and goods where part of the installation is to be done on request of the contractor/owner and full installation is not possible at this stage.
  21. Customer remains responsible to prune trees & shrubs to ensure maximum sun collection for solar panels.


Swimming pool heating

Solar Swimming Pool Heating

Enjoy the luxury of a quality solar heated swimming pool and extend your swimming season to 9 months or more. A Heliocol swimming pool heating system will enable you to heat your water with 6º to 8º.  The product offer a 10-year product warranty and will have a life expectancy of 20-years.

How does the HELIOCOL Solar swimming pool system work?

A typical Heliocol Solar Pool Heating System is plumbed into existing pool plumbing. Even if your system is not identical to the illustration image shown below, the illustration can help you understand the flow of water from the pool, through the pump, filter, solar system and back to the pool.

Notice that the union check valve is plumbed in after the filter. This prevents the filter from being backwashed by the water draining down from the panels when the pump shuts off. Notice also that the 2-way valve either diverts the water to the solar system or directly back to the pool. It features a 5mm hole through the ball of the valve to enable water in the solar system to drain back to the pool when the pump shuts off.

Using the existing circulation pump the water flows through the filter and then directed to the collectors. Check valve for preventing backwash of the filter when the collectors drain down. A two way valve that directs the water to the collectors when there is efficient sun radiation. Vacuum release valve for automatic draining of the panels after the solar system shuts off. Inlet to the solar panels at the lowest side of the bank, using the “reverse return” method. Outlet from the solar panels back to the pool.

Our products
  • Heliocol solar panels with a 10-year product warranty and 20-year expectancy.