Specialising in
Grey Water
Rainwater Harvesting systems in South Africa .

Solar Water Heating – Split Systems

Posted by: Yes Solar Cape (Cape Town, South Africa) – 08 September 2010

Unlike a Thermosyphen System that is normally a complete on-roof hot water system; a Split System uses a pump to move a glycol liquid through the collectors and into the heat exchanger of the storage tank, where the heated, pumped glycol solution heats the household water.

Flat Plate Collectors used in a Split System

Although this system has more components than a thermosyphen system and consequently more expensive, it has two advantages:

1. The storage tank (geyser) does not need to be placed directly above the collectors, allowing the tank to be placed up to 20 m away from the collectors.

2. The system is more efficient as the pump regulates the flow rate of the glycol solution through the system.

Two types of pumps are available to circulate the glycol:

  • Electric, which relies on grid electricity; and
  • Photovoltaic, which are carbon neutral and make the installation independent of the grid.

Split Systems are available with either Flat Plate or Evacuated (vacuum) Tubes.

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