Vacuum tubes produce heat over a wider spread of the season than any other system on the market, and thus provide more useful heat.

The sun’s radiation is absorbed by the selective coating on the inner glass surface, but prevented from re-radiating by the silvered innermost lining. In fact it is very efficient, of the sun light’s energy hitting the tube’s surface, 93% is absorbed, whereas only 7% is lost through reflection and re-emission.

The vacuum tubes are a great retro fit solar panel, modular and easy to install with great performance throughout the year.

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