The Multi-valve Collector Array In this Microsolar patented design the first change is that there is no lower tank. Each collector tube has its own feed pipe, which completely eliminates the non-uniform flow rate of the standard parallel collector array.

The second change is that the top tank has been increased in size to become the reservoir. This completely eliminates horizontal flow and avoids all of the mixing and turbulence issues of any previous system.

Since all flow is now straight up or down, following the natural direction of convection flow; there is no stagnation and no hot spots. And because the collectors are connected directly to the insulated hot water tank there is no overall constriction of flow diameter, or bottleneck, in the thermosyphon flow.

The combination of the separate inlet and output tubes allow the injection of hot water from the collectors deep into the tank while not interfering with the downward flow of colder, heavier fluid destined for the bottom of the of the collectors.

Since all fluid dynamics problems are solved with this design the remaining issues are related to the efficiency of materials.

At the time that this design was released, it was the hottest thermosyphon solar water heater, anywhere.