Vacuum tube solar water heater consists of a number of rows of parallel transparent glass tubes linked to a header pipe and where the heat transfer fluid circulates and also absorb heat generated by means of tubes. These glass tubes are cylindrical in form. Therefore, the angle of the sunlight is perpendicular to the heating absorbing tubes which enables vacuum tube solar water heater to perform well even when sunlight is low just like when it is early each morning or late in the afternoon, or when shaded by clouds.

The Vacuum tube solar water heater consists of single or multiple parallel transparent glass tubes supported on the frame. Compared with the standard plate collector, the Vacuum tube solar water heater is generally more modern and more effective.