This vacuum tube solar water heater is a typical household solar water heater.
This kind solar water heater has the limitatin since the pipe needs to fullfill with water, it isn't anti-freeze.
Performance Data Vacuum Tubes
1. Whole glass vacuum tubes adopt super hard borax and silica glass;
2. Absorb rate: 93%, thermal radiation rate: 6 %( 100)
3. Temperature when exposed to sun without water: 250C, 2.5hours to boiling if using single tube;
4. Resist 25mm hail, using life can last 15 years.
This solar water heater is an economical choice.
English 
