W-56 collector uses the TB-I tubes in a parallel array. The collector operates using simple convection principles. The colder water enters the manifold inlet (the bottom of the manifold) and leaves from the outlet (the top of the manifold) as heated water.

Each W-56 collector is comprised of twenty eight (28) horizontal placed TB-I tubes placed on each side of the manifold. By controlling the flow rate water flows through the collector and get heated to the optimum temperature.

With its advantages of low cost, simple structure, and large aperture area per unit, the W-56 collector is extremely suitable to be used in industrial applications such as factory preheating systems, schools, hospitals, hotels, laundries, and restaurants, etc.

W-56 collector operates under a simple convection principle. Water enters the bottom of the square manifold inlet and leaves at the top of the manifold. The flow inside the glass tubes is indicated with the arrows (in the diagram). The flow will be naturally driven, as the walls of the tubes are hot due to the solar irradiation.