Advantages of evacuated tube technology

Easier Installation

One person can quickly and easily install a SUNDA collector without a hoist or special tools because the vacuum tubes, manifold, and frame are installed separately. This unique feature results in substantial savings in installation time and expense.

Superior Insulation

As any good thermos bottle proves, there is no better insulator to heat transfer than a vacuum. SUNDAs glass tubes are evacuated to 10^-5 mbar, which provides excellent resistance to heat losses via conduction and convection, even under extreme environmental conditions like cold winter temperatures and wind. Flat plate collectors can lose a considerable part of the heat energy collected back to the cold environment.

Easier Servicing

Since the evacuated tubes are installed in the manifold via dry connections, any tube can be replaced without shutting the system down.

Longer Life

High vacuum protects the absorber surface from moisture, condensation, corrosion, and degradation of the selective coating over the entire life of the collector, which easily exceeds 15 years.

Better Efficiency

Vacuum technology insures a high year round efficiency.

Combination Systems Possible

Domestic water and space heating from a single array are possible.

Better Energy Conversion

More energy is collected earlier in the day and during partly cloudy days because of the special absorber coating and superior insulation.

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