About the vacuum-coupled solar heater from Unisol Aquecedores:

The tubes present in this vacuum-coupled solar heater are named this way precisely because the thermal insulation that prevents the water from losing heat is the vacuum ( the best thermal insulator currently available ).

Therefore, in addition to being extremely resistant to various impacts, freezing or water corrosivity, the performance and effectiveness of the vacuum-coupled solar heater is far beyond that of common collectors on the market.