Rinnai’s Sunmaster Evacuated 25 Tube Systems 270L consists of a cost-effective Vitreous Enamel ground mounted tank and highly efficient tube solar collectors. The collectors are mounted on your roof without any need for reinforcement and can be installed separately to the tank. A solar control unit ensures water circulates between the tank and the header across the top of the tubes. Developed by Rinnai who have been providing reliable, innovative, and durable solar products for over 45 years.