The Evacuated Tube absorbs the suns radiation through the clear outer glass and traps the heat within the inner black tube. A vacuum between the two layers of glass, combined with the unique inner tube coating, prevents the heat from escaping. A copper heat pipe contained within the black inner tube transfers the trapped heat to the tip of the Evacuated Tube. The tips can reach temperatures in excess of 250 degrees Celsius and this is what heats the water in the manifold.

Once the water is heated, it is pumped back to the cylinder and more cool water is drawn from the bottom of the cylinder back to the manifold and so the cycle continues. The water flow between the manifold and the cylinder is managed by an Electronic Controller and it works on a temperature differential of approximately 10 degrees. Managing the water flow efficiently is a significant part of achieving maximum performance of the Solar Water Heating system and there are a variety of options available that will suit virtually everyone's needs.