The vacuum in the glass pipes is which in fact 10?5, which in fact is the best insulation. They do not keep a dust on their surface and it is not necessary to be cleaned. The vacuum pipes are made of boro-silycate glass with a thickness of 2.5mm that make them resistible to a hail stone of 35mm. The protuberance of the absorber allows maximum sun shine receiving during the day, starting early from the sunrise until the sunset.

The dry vacuum tubes work without circulation fluid inside. The vacuum tubes absorbed the sun shine even at cloudy or gloomy weather with intensity of 15-20W. High efficiency of the insulation reaching up to 92%.

Despite of water heaters main usage for providing a domestic hot water or heating, they accumulate the absorbed by the solar panel sun energy. The coil heat exchanger transfer the heat energy of the solar panel to the heat energy of the water in the water heater by means of the circulation fluid in the pipe system. As a result of that the heated water can be used either as a domestic hot water or for a heating. The vertical standing water heaters are with better performance and therefore, they are the most preferred ones.