Rinnai’s Sunmaster Evacuated 30 Tube Systems 175L consists of a ground mounted storage tank that is installed separately to the tubes mounted on the roof. The tubes on the roof offer minimal impact on the aesthetics of your roof and there is no need to reinforce your roof structure for them. A solar control unit ensures water circulates between the tank and the header across the top of the tubes. This impressive system is frost tolerant for temperatures as low as -12° C and has a sacrificial anode is provided in the tank for added protection. Rinnai’s priority is always high efficiency and innovative, durable technology.