Did you know that the normal household geyser consumes up to 40% of a household’s electricity ? There is therefore a lot of scope to reduce household electricity by managing the electricity consumption of the geyser.

It makes financial sense to get your geyser off the grid by installing a solar water heater. However, the uptake in solar water heating in South Africa has been much slower than expected. Most of the solar water heating technologies available in South Africa uses thermal technologies where water is pumped or syphoned through a collector (on the roof) to heat the water in the geyser. These thermal technologies were however already designed in the early 1900’s and the technology still remain the same today.

With South Africa’s extreme climates (frost in winter and very warm summers), thermal technologies have many shortcomings. For example, in winter collectors may burst due to freezing conditions and during summer it is very difficult to prevent the water in the geyser from overheating. The boiling water in the geyser can be very dangerous and also cause premature failure of fittings such as collectors and pumps.

Geyserwise has many years’ experience in the water heating industry. We have designed a unique water heating system that makes use of photovoltaic technology and a unique PTC AC/DC element to heat water in the geyser. This differs from the traditional thermal hot water systems where water is cycled from a collector through pipes to the hot water cylinder by either making use of a 220V pump, 12V pump or through a natural thermo-siphoning process. By making use of PV panels that produces DC power to heat the water (instead of circulating water through pipes) a lot of the problems with traditional solar water heating systems are eliminated.

The advantages of the Geyserwise PV water heating system compared to solar thermal water heating systems are as follows:

  • Any existing geyser can be converted (we only cater for 100L, 150L and 200L geysers).
  • No additional plumbing is required.
  • Long pipe runs are eliminated.
  • No pumps necessary to circulate water.
  • No risk of damaged panels in frost prone areas.
  • Water temperatures can be controlled on very hot summer days – eliminating risk of overheating.
  • Suitable in all water conditions.
  • Suitable for buildings where the geyser is not situated near the panels.
  • No geysers and tanks exposed on the roof.
  • Modular system – can be expanded to build off-grid power system for the home.

Atypical 100L geyser installation will look as follows:










For more information on this innovative water heating system, you can contact or offices:

Geyserwise Cape Town:
Tel: 021 592 4903
Address:151 Cook Street, Goodwood, 7460

Geyserwise Centurion:
Tel: 012 653 1020
Address: Unit 9A, Edison Business Park, 183 Edison Crescent, Centurion, 0183.