Integrated systems
An integrated system comprises of a solar water tank, evacuated tubes which are permanently attached to the tank, as well as a frame, holding the complete unit together as one. Himin manufactures two types of integrated systems, namely high - and low pressure solar geysers. These geysers are highly efficient, utilizing evacuated tube technology which, other than flat panel technology utilizes ultra violet (UV) rays to generate solar heat even when the sun is obscured by clouds or rainy weather. Himin solar geysers are fitted with electric elements, should heating of water be needed during the night or during prolonged periods of bad weather when the generation of solar power is less efficient.

High pressure
The high pressure unit has been designed to operate at a pressure of 400kpa, similar to standard electrical geysers available in South Africa. Hot water is generated through a thermo siphon process, utilizing heat pipe technology. A heat pipe comprises of an evacuated tube with an aluminium insert which holds a thin copper heat pipe in place. The copper heat pipe, which extends into the geyser tank and which becomes a solar heat exchanger or “element” is filled with a glycol type mixture which produces the heat transfer to the water in the tank.

Low pressure
The low pressure unit has been designed to operate in both low as well as high pressure environments, although the actual water tank is a low pressure unit. In a high pressure environment, an electronic control system reduces the pressure from the standard 400Kpa to 0Kpa before it enters the tank, and increases the pressure to around 2.5Kpa through a specially designed pressure pump once it exits the tank (when a tap is opened). Hot water is generated through a thermo siphon process, utilizing evacuated tubes. When the geyser is filled, the evacuated tubes fills automatically with water, and once full, heats the water and circulates it continuously into the tank through a natural thermo siphon process. Low pressure systems generally are more affordable than high pressure systems.