The standard tube works on a heat pipe conduction, there is no water inside thus it successfully prevents the defects of tube block and low power output caused by water fouling and deposits of dust and sand.

-It prevents the tube from being easily broken by volume expansion when the water in the tube freezes in freezing conditions.
-Low thermal capacity makes the tube start up quickly. Energy inside the tube can be taken out within only 2 minutes under sunshine.
-The insulation temperature of the heat pipe can reach 256c. The average heat efficiency can still be more than 50% even at temperatures as low as (-40).
-High efficient selective absorptive coatings and vacuum heat insulation technology ensure the tube gets a higher heat output in cloudy weather and in damp conditions, especially in winter.
-It perfectly solves the fatal defect of the common all glass vacuum tube solar water heater, which will not run if one of the tubes is out of work.