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EVACUATED TUBE SOLAR COLLECTORS
Evacuated tube solar collectors have become popular due to their high efficiency, additional warranty and low maintenance.  The tubes are similar to a split system in that the tubes are mounted on the roof and the storage tank is located at ground level.

Evacuated tubes use a glass tube with a vacuum inside and copper pipes running through the centre.  The sunlight strikes the dark absorber coating inside the tube.  The heat pipe then transfers the heat up to the copper header pipe located in an insulated manifold box.  A circulator moves water from the storage tank to the copper header pipe warming the water.  The solar heated water is then pushed down into the storage tank for use.

Tubes also offer excellent cold weather performance with an inbuilt anti-frost system.  They are more expensive than solar systems with flat plate collectors but are more efficient as they can extract the heat out of the air on a humid day and don't need direct sunlight.

Warranty on Evacuated tube solar systems is 15 years for the solar collector, framework and stainless steel tanks and 10 years on the vitreous enamel glass lined tanks.  Installation and other parts are warranted for 12 months.