The Rinnai Sunmaster Evacuated 30 Tube Systems 320L consists of a cost-effective Vitreous Enamel ground mounted tank and highly efficient tube solar collectors that can be installed separately. The tank comes with a sacrificial anode for added protection and the whole system is frost tolerant for temperatures as low as -12° C. A solar control unit ensures water circulates between the tank and the header across the top of the tubes. There’s no need to reinforce your roof and it offers minimal impact on the aesthetics of your roofline. Rinnai has been providing innovative and durable technology with the environment in mind for over 45 years.