The inner tank is made up of SUS304-2B stainless steel, adopts two advanced welding technologies. One is automatic double sides protection argon arc welding technology, the other one is automatic rings argon arc welding technology. Thus, nearly no damages were done to the stainless steel.

Much better performance in heat transmitting than metal heat pipe.
Larger quantity of heat participate in heat exchanging with water in tank. Compare with common vacuum tubes, nearly all the heat absorbed by theglass heat pipe takes part in the exchange with the water in the storage tank, while there are always some hot water stayed in common vacuum and does not take part in the exchange with the water in the storage tank at all.

Feature 1. Reliable, efficient, patent vacuum tubes. 2. The vacuum tubes absorb the solar energy and transfer into the heat energy, then pass it to the U pipe, rapid heat transfer, high temperature. 3. It is steady and credible. 4. Easy installation.

Heat pump water heaters　They are more efficient than electric resistance models because the electricity is used for moving heat from one place to another rather than for generating the heat directly.