Solarkeymark Certificate Copper heat pipe,can working under -35C degree weather,heat pipe with 0.8mm wall thickness
The heat pipes used in AUCKLAT solar collectors have a boiling point of only 25°C So when the heat pipe is heated above 25°C, the water vaporizes.
This vapor rapidly rises to the top of the heat pipe transferring heat. As the heat is lost at the condenser (top), the vapor condenses to form a liquid (water) and returns to the bottom of the heat pipe to once again repeat the process.
With Anti-freeze liquid inside,can working under-35C.