Heat insulation of water tanks adapts polyurethane foam and 55mm thickness
Silicone rings to connect and seal
Tubes and supports are adjustable
Power bearing is average
Can assure vacuum tubes to use for long time
Whole glass vacuum tubes adapts super hard borax and silica glass
Absorption rate: 93%
Thermal radiation rate: 6% (100°C)
Temperature when exposed to sun without water: 250°C, 2.5 hours to boil if uses single tube
Uses electrical appliances to aid heating to switch-off power supply before boiling
To test water temperature before using in order to avoid scalding
Resists 25mm hail
Lifespan: 15 years
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