Rinnai’s Sunmaster Evacuated 30 Tube Systems 270L was developed with the environment, low emissions and high efficiency in mind. It consists of a ground mounted storage tank that is installed separately to the tubes mounted on the roof. A solar control unit ensures water circulates between the tank and the header across the top of the tubes. Available with electric boost or continuous flow boost, it is frost tolerant for temperatures as low as -12° C. There is no need to reinforce your roof for the collector and the tank comes with a sacrificial anode for added protection.