It is a direct system which allows water to be circulated using a pump. The circulated water circulates through the vacuum tube manifold. Solar energy from the sun is transferred into the storage vessel which is your existing geyser. The circulated water which is hot, can be used. Therefore, the vacuum tube system is used as a solar collector. SA solar Technology provides a 12V circulating pump for the water circulation. The vacuum tube pump is installed inside your roof. The vacuum tube solar geyser pump is also installed on the supply of cold water on the existing electrical geyser while the pump is powered by a smaller solar panel.