The Solar Vacuum Glass Tube Collector (SVGTC) delivers free solar energy generated boiling water within two hours. Made from strong "Pyrex" (borosilicate) glass, these new generation co-axial selective coated solar vacuum glass tube collectors is more than 70% efficient in converting solar infra-red energy into thermal energy. Solar infra-red energy penetrates the transparent outer glass tube, right through the vacuum layer and gets absorbed by the black selective coating on the outer side of the inner tube.