High-pressure geyser technical specifications

Due to changes in regulations, it is currently not possible for us to stock high pressure solar tanks. 

Choosing between a low or high pressure geyser 

Municipal water supply is usually between 1bar and 5bar (depending on location and time of day).

High pressure solar geysers can be connected directly to a high pressure water supply such as municipal water supply without a pressure reducing valve. This will allow integration to an existing plumbing system. Hot water pressure at the taps or shower head will be similar to the cold water pressure and will allow higher flow rates.

Low pressure solar geysers are open to atmosphere, hence the hot water pressure will be equal to the static water head (height of which geyser is mounted). The low pressure solar geyser can be used on municipal water supply if a pressure reducing valve is used on the cold water supply to the plumbing system (this will allow mixer taps and showers to have balanced water pressure between hot and cold water). The auxiliary tank acts as a pressure reducing valve on the hot water side.

Please note our high-pressure geysers are temporarily unavailable but please keep an eye out as they might be back in stock in the future.

The high-pressure systems were available in a Stainless Steel series and a Green & White series. The differences are explained below.

Available models:

 Stainless Steel Series  Green & White Series
10 Tubes per 100L 10 Tubes per 100L
100 Litres - 10 x 1.8m Tubes 100 Litres - 10 x 1.8m Tubes
150 Litres -12 x 1.8m Tubes 150 Litres -15 x 1.8m Tubes
200 Litres - 20 x 1.8m Tubes 200 Litres - 20 x 1.8m Tubes
250 Liters - 25 x 1.8m Tubes 250 Liters - 25 x 1.8m Tubes



Stainless Steel series Green & White series
 5 Years 2 Years


Outer tank material:

Stainless Steel series - 0.4mm Stainless steel sheet.

Green & White series - 0.4mm White steel sheet.


Inner tank material:

Both series' inner tank consists of 1.2mm SUS 304 stainless steel.


Insulation material:

Both series have 55mm thick polyurethane foam between the inner and outer tank.



The high-pressure tanks can weigh up to 50kg.



 Stainless Steel series Green & White series
500kPa 500kPa


Evacuated Tubes:

  • This is a standard 1800 mm length x 58 mm diameter x 2 mm thick glass tube. These tubes are designed to withstand 38 mm diameter hailstones.
  • Heat transfer into the high-pressure tanks is done with copper heat pipes. Heat pipes utilize a liquid which boils and condenses, thus causing an effective heat transfer cycle.
  • There is no water inside a high pressure vacuum tube. Thin aluminium plates and a copper heat pipe transfer the heat from the hot black inner vacuum tube to the tank.

Optional electric backup system:

All models can accommodate a standard 32 mm screw-in South African electric element with pocket. It can be controlled with either a thermostat or an SR609 programmable controller.

SR609 smart controller:

The SR609 is a programmable electronic control panel. The features include:

  • The display of the water temperature inside the tank that is measured by a probe that fits inside the pocket of the element.
  • It can be set to heat the water in the tank electrically in three cycles of time and temperatures.
  • Default: if the water is cooler than 54oC between 4 and 5 am, the water will be heated to 60oC. The same happens between 5 and 10 pm again.
  • A manual button raises the temperature up to the programmed temperature (usually 60oC), whenever needed.
  • There is a battery backup, so it will not forget its settings.


The choice between low and high pressure:

If you want to keep your municipal or pressure pump pressure, a high-pressure system is the better choice. You will have less available hot water compared to the low-pressure systems, because high-pressure geysers do not store hot water in the tubes like low pressure systems. 


Installation instructions and additional information available at Technical Support.