55mm Replacement Glass Vacuum Tubes 1800mm long

Glass Vacuum Tubes for Solar Geysers 

Model 58mm/1800mm         Withstands Hail Size : 38m

Important:

The High Pressures Solar Geyser Glass Vacuum Tubes are as shown in the image. they have an internal heat stystem that takes the heat of the sun to the water, the bulb shown on top fits into its  socket on the geyser. Even if the Glass Vacuum tube is removed , and not present NO water can leak out due to its absence. 

This means even if you break and remove a Solar Geyser Glass Vaccum Tube No  pumbing is nessary, just loosen the retainers and take it out

The LOW PRESSURE SOLAR GEYSER GLASS VACUUM TUBE DO NOT HAVE THE INNER HEAT SYSTEM

They are cheaper and they are more effective, they are very capable of bring your water to boiling piont on a hot sunny day

Water circulates in the middle of the glass vacuum tube, to replace one of these tubes the geyser has to be drained.

Remember

The bottom of the Glass tube Never really see's the sun , after ten years or when you feel the geyser is loosing effeciency, simply turn the tube so the bottom is now facing the sun,

NOW : Good to go for another ten years

Here are the techincal spec's on the Solar Geyser Glass Vacuum Tubes

• Length 1800mm
• Material Borosilicate Glass 3.3
• Vacuum P<5x10-3Pa
• Glass thickness 2mm ± 0.15mm
• Outer tube diameter 58mm
• Inner tube diameter 47mm
• Thermal expansion 3.3
• Absorptive coating AL/N/AL
• Absorptive coefficient >92%
• Emission coefficient <8%
• Freezing temperature <-20oC
• Stagnation temperature >250oC
• Net weight ≥2.4kg

Idle sunning property parameters ≥ 175m2 x oC/kW
Solar irradiation for obtaining a preset water temperature ≤ 4.7 MJ/m2
Average heat loss coefficient 0.90 W/ (m2x oC)