Since the Power-Spar® concentrates the sun's rays onto a small absorbing area, the heat loss of the entire system is minimized. This is one of the reasons that allows the Power-Spar® system to yield extremely high winter heating efficiencies.
In addition to the glycol fluid, optional high efficiency multi-sun solar cells can be added on the Power-Spar® absorbers. By placing the PV cells in the concentrated light, their electric current is amplified significantly - a three watt solar cell can produce up to 10 watts. Effectively lowering solar cell costs by a factor of three.